Having to flip little bits of cardboard open in the model just to show that they open seems a bit unnecessary and could even be dangerous to the model if nerves are affecting one’s motor-control! with a try square) to the other side and completing the cut in exactly the same place on this side. This is also the problem when using foamboard for wall construction. I wouldn’t say that elements of colour are totally ‘banned’, but particularly here it is important not to upset the overall balance. for attaching to the backs of window frames, small strips of double-sided tape are much cleaner than glue. The designer may build a version earlier in the design process to test the designâs three-dimensionality ( to check general proportions, to better visualise filming possibilities etc.) Once its done, the feather board is ready to be peeled off from the side to be embossed by slipping the sharpened blade between the cardboard and the foam at one of the corners. Even in the simpler case of practical doors it may be better just to glue them ajar to show that they’re practical. I think that at the very least off-white, beige or light-grey should be used because white is far too glaring .. it bounces the light within and around it like a pinball and consequently it gives a misleading impression of interior spaces! But it’s different when copies of the technical drawings are pasted to the surfaces .. there is less glare and, dependent on the style of drawing and the copier settings, often a variety of grey tones. Examples are Kapa-line foamboard and London Graphic Centre’s Premier Polyboard. The same is true generally of ‘greyboard’ or recycled grey or brown cardboard which is hard and full of gritty particles. It may offer no information on colour, little on texture and materials, but all the most essential information on space, structure, movable elements and their practical implications. It is essential to have white mountboard (or equivalent white card between 1-2mm thick) i.e white on both sides rather than white/black. One tip is that if you want UHU to stick firmly more immediately .. almost as superglue does .. you have to apply the glue and position the piece down as you normally would, pressing firmly, but then lift it up again just a few millimetres. Its main advantage is in combining ease of cutting with robustness (i.e. Tape that foam board sheet down to a table. often misunderstood) when it comes to the white card model. This would then need to be made detachable. Interesting process for easily getting a beautifully curved shield. It gives an overview for the technical crew responsible for building and furnishing a set (or modifying an existing one) of how much work is required. All can be cut on a band saw, but failing this the best way to ensure a straight cut right through is (as with thick foamboard) to start cutting half way through on one side, take the line round and complete from the other side. Colour can become a distraction, giving visual weight to some elements to the detriment of a balanced overall view. Using ratchet straps tighten them down against the two pieces of wood. This is the normal size sheet (20 inches by 30 inches and 5mm thick). Any excess solvent outside the joint quickly evaporates resulting in a very clean joint. Make a Roman Scutum . That’s the percentage reduction. Step 6 You can also just adhere it to the front with spray adhesive. One should usually allow at least 15 minutes for this. One canât mark on acetate with a normal pencil so either the shape to be cut needs to be drawn on paper and used as a template underneath or the surface covered with masking tape and lines marked out on that. Expanded polystyrene is basically the same substance but formed differently and the cells are much larger. Cutting It is therefore quite literally a three-dimensional âblueprintâ of the intended design. The best way to keep foamcore from curling is to frame it, but if this is not practical, there are a couple of alternative methods. These tend to break up or canât be sanded down below a certain size. Usually the thin white card sold in art shops is not labelled by thickness but according to its weight per square metre. Bend your Styrofoam piece if you require a curved shape for your project. Don't worry too much about fraying the edge but just try to create a clean cut around the edge making sure to do 1 inch of excess cloth. Press Esc to cancel. This form of model-making is, I think, still proving itself invaluable despite increasing competition from the likes of SketchUp. If it needs to be a perfect curve, a stencil or some other guide is the best way to draw it. Neither a scalpel nor Stanley knife will go very deep so often a sharp penknife, fruit knife or serrated bread knife will serve better. Keep your movement smooth from top to bottom and try to not vary the depth of your knife at all while you are cutting. Thick Styrofoam foam board can be found in many building applications to help insulate homes as efficiently as possible. Cheaper foamboards are filled with a relatively coarse-celled polystyrene which doesnât stand up to solvent glues or spray-paints, whereas the foam interior in more expensive brands may be denser, giving a cleaner, more solid cut edge and perhaps a slightly more dent-resistant surface. She holds a bachelor's degree from the University of Arkansas. These are then cut out and assembled to form 3D structures. The ‘rule’ is that anything which has a significant physical bearing on the set space (such as a pillar, steps, changes in floor level, opening doors, railings etc.) Allison Cartwright has been writing professionally since 2009. Similarly if a ceiling exists in a used location it should be included, to make it clear where it is, even if the camera is going to avoid it. For example, when asked to double the size of an A4 drawing many might think âA4 to A3â but this, although doubling the surface area, is not doubling the dimensions. These are just as important to the production process because they make sense of how the various embodiments of the ‘set’ (whether CGI, built interiors, realistic physical models made for filming) are meant to fit together. ‘Plastic Weld’ (as with other brands of dichloromethane solvent) works best on styrene plastics but in tests I found that it did work on the foamed Pvc though it took longer to set. Then extend the blade out and make a second cut which slices the rest of the board. It is light and very easy to cut, though quality and properties differ widely according to brand and price. For example, a 1:50 scale model will be âsmallerâ both in scale and physical size than the same structure modelled at 1:25 scale but the 1:50 version might sometimes be referred to as a âlargerâ model because it enables a âlargerâ area of the real thing to be modelled. .. in how one renders one’s own technical drawings (better still if it actually enhances rather than detracts from the communicative clarity of them!) Although it contains oil it can be painted with water-based paints or glued using Pva quite easily. It is usually made once the design has been finalised, most often incorporating the detailed technical drawings created for the construction of the set. Less obvious, isn’t it? Doing this will allow more of the blade to come into contact with the board and will give you much better results. Because of the board's excellent thermal properties, you can use thinner foam boards in place of thicker foam boards made of polystyrene and polyurethane. I’ve written elsewhere that I don’t consider pure white card to be the right medium at all when it comes to representing, or even just mocking up spaces. In the case of the floor, even differences under 5cm could have a huge physical impact in terms of moving things around, so it would make sense to emphasize these physically in the model. Changing elevation around curves with foam board Posted by Anonymous on Sunday, February 8, 2004 3:49 PM I am considering the foam board techniques described by Bill Darnaby in MR, and can see how it would be easy to incorporate grades on a straight run along the wall. For starters, it has one side that has ridges or bumps on one side of it, the other side being flat and smooth like a regular foam board. Superglue works very well on both plastics for a quick, strong bond but working with superglue is a practised art because there is no time for repositioning before the glue takes. of plastic together. ForPro Curved Foam Boards are made of the finest adhesive, foam, and sandpaper. How to Cut Foam Core Board- The Right Way January 29, 2015 by Breanna Carlile Making your craft project look crisp and clean can be a difficult task when using foam core board, but it doesnât have to be when you know what youâre doing. secure enough to be a good support, not only when transporting the model but also for resting it down even where there are no totally free table-tops available. It is usually not a realistic, atmospheric rendition of what the set will look like, let alone how it will appear in the film. If the set design has been conceived and developed largely on the drawing board it may be only at the ‘white card model’ stage that this is even considered! Cartwright has published several eBooks on craft and garden-related subjects. The fine teeth will create a fine foam dust that can be vacuumed. Sharpen one of the long edges of a narrow putty knife blade, then use the tool to slice slight curves in the foam. A third alternative (but only if gluing acetate to another plastic such as styrene) is the thin plastic solvent available for melt-gluing a range of plastics (e.g. The best advice I can give (apart from the points above) is to spend a little time getting acquainted just with what it feels like to press the scalpel blade firmly against a metal edge and move along evenly. can be left flat as drawing. One exception to the ‘5cm rule’ may be the floor area .. and this calls for the personal judgement of the designer/maker. Installation of rigid board panels on curved surfaces opens itself to multiple thermal breaks which again has an impact on the insulating performance of the building. Also, whatever you decide to cut with should be held as horizontally as possible. Most often the master groundplan is used, spraymounted to the baseboard. glued surface-to-surface) only spots of glue are needed to hold them firmly in place otherwise the water-based glue will cause warping if spread on too liberally. In my experience, as long as the essential proportions are right this figure should be as simply conveyed as possible and flat cut-out figures often look better in this context than 3D ones. On the other hand, anything protruding 5cm or more should be given that physical thickness in the model! For example a thin modern radiator could be just drawn whereas an older, more âbulkyâ type really needs to be represented more physically in 3D (at the very least as a separate cutout which is stuck at the correct distance from the wall to convey the object’s total depth). First, they dry-fit each board into place, measuring and marking where to place the 22-degree lap cut that will cleanly meld it to adjoining trim, the square cut that will butt it against a door frame, or the 45-degree-angle that will fit it into a corner. Model in preparation for the build of the Sarang moon-station for the film âMoonâ 2009 on Shepperton Studios K-Stage. There should be no short-cuts taken when representing steps, even long, regular flights of them (i.e. The material needs to be cut half-way through in repeated parallel lines (as little as 2mm apart for a tight curve), making it more flexible. As a general rule when cutting anything by hand with a knife it is always better to take things carefully and slowly. I have lots of foam board projects on my youtube channel: 1. per cubic foot, giving it significant durability. It is understandable because making them can be tedious, but âsandwichingâ foamboard or card to form the correct âriserâ (meaning the height of a step) and then simply layering these is one way of making construction much easier. The blade of a utility knife is easy to replace at the first sign of dullness, and it can be used for a multitude of other things. Be sure to select boards with fairly straight grain and no knots so they can bend without breaking. It helps even more if the height indications included on the drawn ground-plan are kept visible .. another good reason for using the actual ground-plan, pasted to the baseboard. However, if it is used and needs to be made white I would recommend spraying it first with Simoniz white acrylic primer. with a 24 gram blue wonder and a 800 mAh LiPO. The curved design follows the natural curve of nails and is ideal for filing the surface area around cuticles. Doing so will make sure that the knife can reach all the way through at the angle you are cutting at with length to spare. This rigid foam layer needs a minimum R-value of R-5, and that's impossible with 1/2 inch of foam. Showmanship may not be strictly necessary in practical terms .. but it can inspire! Even this kind of model can be stylish as well as functional and, dependant on individual taste, ability and.. most importantly.. time, it can be embellished with graphic detail, structural finesse or effects designed to âsellâ the visual concept. Thin acetate sheet is the most available clear plastic to use for representing window glass. Save my name, email, and website in this browser for the next time I comment. Practicals (i.e. It is a common mistake to forget that something will be seen through a window, or an open door. This may not always be visible or matter, but better right-angled edges are needed when gluing two pieces together to make a corner. Ceilings are a bit of a ‘grey area’ (i.e. Don't waste your money on it, it's extremely slow. Foamcore is simply a sheet of fine-grade foam sandwiched between two sheets of thick paper, and moisture causes curling by weakening the paper layer and popping the air bubbles in the foam, causing distortion. Avoid ⦠IIRC, it cut at a rate of about 4"-5" per minute. Superglue for example will âfogâ acetate around the area glued while both the âcementâ intended for plastics and UHU tend to be difficult to control. There should be a unity .. or rather, the word is homogeneity .. of colour and treatment throughout the model. But it should show very clearly where the floor is âthe setâ and where it is not, so sometimes it makes sense for the ‘offstage’ to be differently coloured. Foam board insulation is often used in garages, work sheds, or other spaces that may not require interior finish or wall trim. For example, a pair of kitchen scissors will cut through it if you don’t care about the edges, and even a hand saw can do the work if the board is too large for scissors to handle. This may seem like a contradiction in modern language but you’ll understand, it’s the best way of describing actual physical scale models made of buildings, structures or landscapes that are never going to exist in their entirety in real size .. but are treated as if they will! If you visit Warner Bros. ‘The Making of Harry Potter’ you’ll see a number of these, alongside other white card models for interiors and other large ‘props’ that were physically built. FOAMULAR 150 1 in. Whereas PU foam is not affected by solvents and can be glued quite effectively with UHU, contact adhesives or even superglue, styrofoam and polystyrene require special âfoam friendlyâ glues such as âUHU Porâ or solvent free (I recently found that Gorilla Glue will also work very well since it is polyurethane). If you’re lucky, slight changes in level are easy to achieve just by layering different thicknesses of card on top of the baseboard. As with all straight cutting, it should be done against a flat metal ruler (non-slip, or with masking tape along You will be able to tell if a knife is genuinely sharp or not when it comes to foam board because a sharp knife can slice through the whole thing in one smooth cut. Plug in a small wire cutter until the wire is hot. HOW-TO: Carve Tombstones from Insulation Foam Board. Foam boards are also known as foam core boards, the terms are usually interchangeable. Strong Pva wood glue should work with all though takes a lot longer to set. Such experimentation can directly pool into what I call our general âcreative matrixâ as designers. Gluing I’m keeping it in the Methods section for the time being, though not sure whether it shouldn’t go with Technical Drawing. Once all the kerfs are cut, the team begins attaching the baseboards to the curved walls. The problem with using one of these, besides the melted edges it can leave and the burns it can cause if you are not careful is that it can release the potentially toxic fumes of the foam. This is one of the most common problems people experience when cutting foam board. These may well become inevitable with a ‘working’, much-carried cardboard model, but just a little bit of extra strengthening can limit the damage. In cases like this the simpler shortcut would be to make the model with the blinds open and make separate inserts to convey the effect of them down if this is necessary. The model above was created by Patrick Scalise while a student at Wimbledon College of Art. Strong PVA glue (always better to use the âwood glueâ type rather than the economy-style âschoolâ glue) will bond foam-to-card well but not instantly, so joints often have to be temporarily taped together with masking tape while setting. Matte is definitely better to choose (there are some semi-glossy types), and avoid white card which has a noticeable layering inside (a bit like plywood) because this is likely to be the toughest to cut! But styrofoam is of particular benefit for achieving curved, streamlined or organic forms. a âlargerâ model is one that is made to a larger scale even if it ends up a physically smaller portion of the whole. Use a straight edge or ruler and use a permanent marker to make a clear and precise line. This treatment also gives it a slightly waxy composition, making it easier to cut and ensuring a very sharp edge. Mountboard on its own is never enough! The rough edge produced can easily be sanded smooth with coarse sandpaper on a sanding block. If scored lightly then bent on the score line it will stay together as corner, which is useful if trying to represent a glass construction without the messiness of having to glue edges. Next to clamp the middle of the blank use two pieces of wood and place them on the top and bottom of the blank. Styrofoam is very finely-celled so it sands very well without crumbling .. using a sanding block it’s possible to get smooth, sharp-edged shapes fairly easily. These foams are very easy to cut with a knife (or hot wire cutter, except PU foam) and both styrofoam and PU foam can be sanded effortlessly to a smooth, sharp finish even for very small forms. It has to be handled very carefully, and unless one has taken the trouble to practise with the material for a while before trying to cut clean edges or door/window openings .. it just doesn’t look good! I would suggest you use it sparingly until you’ve mastered how to achieve perfectly clean, straight cuts. A4 to A2. Just cut enough to be able to bend it backward. Use duct tape or hot glue to adhere it to foam board. I will be coming back to these later, but for the moment we are still concentrating on white card models for physically built sets. For some structures to be represented itâs easier and quicker to make solid blocks rather than having to construct boxes from a sheet material. Otherwise, the model can become chequered with distracting areas of black. These are far better represented as cut-outs where humanly possible. On the one hand a good, robust, polyurethane-core foamboard is invaluable as a lightweight baseboard .. but if a cheap polystyrene-core one is used it is liable to warp badly over time and ends up showing every finger impression! Another form of glue which styrofoam seems to accept is spraymount, especially effective if sprayed lightly on both surfaces like a contact adhesive. These drawings therefore have to be converted to 1:50 .. i.e. The fact that the foam board was almost 2â³ thick also came into play. These are quite strong, but also suitable for delicate cutting. Edwina drew her original technical drawings this way .. little needed to be added to create this rich, convincing effect when used for the white card model. This may directly reflect how the set will be built for filming in which case the so-called ‘floating’ walls will be indicated on the groundplan. You now have the frame of your cornice board. I’ve come to the conclusion that the problem lies in not properly ‘feeling’ the straight edge of the ruler enough to stick with it. However, if the radius is large enough, you may be able to skip this step. Foam board insulation is a relatively inexpensive type of insulation that adds a high R-Value to areas where adding standard installation is either cost-prohibitive or not required. This is usually the scale in which the main technical ground-plans are drafted, and it is generally accepted that this is neither too small to show a significant amount of graphic detail nor to appreciate proportion in relation to the human figure. And a terrific companion to my Roman Gladius sword project. There should always be at least one scale figure included, simply as a familiar indication of scale. The section that sinks can be carefully cut out (a precision job with the scalpel), the paper can be peeled from the back of it and the foam sanded to make it thinner, and the section can then be glued back where it came from .. now a little sunk. Regular acrylic or acrylic gesso are best to use for painting it white, since spray paints will dissolve the surface. I ended up using a sharp utility knife to score it and then snapping the board where the knife blade didn't cut through, like kwikfishron said. Clamp the dowels together, sandwiching the Styrofoam between them. The better brands will usually accept even PVA wood glue quite well for bonding. It is surprising how many people who might in other respects be very able with their hands find it quite difficult to cut a straight, clean line. From my experience of witnessing people trying to cut a straight line (must be easily in the thousands by now!) The ‘white card model’ of the present context is, in many ways, anything but rough and inexact and most often, due to its usual place in the chronology of design steps, it is no longer exploratory. This is certainly true of the superior polyurethane foam in Kapa-line foamboard which will accept even solvent glues such as UHU and spraypaints. and it maidened at 10 oz. The Origins of Artistic Expression – Part 1 ‘Things looking like other things’, The Origins of Artistic Expression – Part 2 ‘The making of marks’, Full course description and daily schedule, Technical drawing for theatre, film or television designers, Introduction and provisional daily schedule, Figure modelling reference images – caryatids, atlantes and ‘hemis’, ‘quick view’ comparisons of casting materials, Using plaster as a filler in polyurethane resin, Filling polyurethane resin with used tea/coffee, ‘quick view’ comparisons of mould materials, Creating surfaces with Kapa-line foamboard, Making relief patterning tools using Sculpey, Printing patterns for scale wallpaper, curtains and carpets, Pressing decoration into foam, shaping and wire-brushing, Template drawings for furniture model-making, ‘Beginner’s Basics’ – mouldmaking and casting explained, Making a simple 2-piece silicone block mould for a puppet head, Making a small mould for a four-legged animal figure and casting in resin, Making a supported silicone mould for a life-size head and casting in fibreglass, Making hollow casts in open or ‘closed’ moulds, Updated sources/prices of specific materials, Some of the principles of technical drawing simply illustrated – Part 1, Some of the principles of technical drawing simply illustrated – Part 2, Advice for anyone interested in beachcombing or mudlarking the Thames Foreshore, ‘Thames Foreshore Collection’ project log, Deptford: Upper Watergate Stairs, St George’s Stairs, Surrey Docks: Trinity Wharf (Surrey Docks Farm), Horn Stairs, Pageant Stairs, Rotherhithe: Globe Stairs to Pageant Stairs, ‘Faim de siècle’ multiple series 1997-2003, Making ‘white card models’ for film or television design, expanded polystyrene v extruded polystyrene. Whether curved walls need to be made in either foamboard or mountboard the method is similar. Foamboard and London Graphic Centre ’ s nothing to say that I have fully updated this article, which originally... Layers ) so easily when finely cut only the 5mm is stocked shops. 5 oz undoubtedly a utility knife with an X-Acto knife being a close second the blank used, spraymounted the. On one side, taking the line you want to cut foam board and still have the edges look can! Affect it grain and no knots so they can bend without breaking were tapered using pleats to make tubeâs. Increasing competition from the same is true generally of ‘ greyboard ’ or recycled grey or brown cardboard which drawn! From the Dollare Store foam board was almost 2â³ thick also came into play to brand price. Need to choose the next time I comment through card with a scalpel but if be! One possible way of solving this is certainly true of the cut in exactly the as! Not labelled by thickness but according to brand and price ‘ Boardwalk Empire: Designing an Empire ’ types card. This card doesnât fragment ( divide into layers ) so easily when finely cut pieces to... Cutting 2 '' foam board does the other side and completing the cut in exactly the same place this. Scoring a line down the middle of it lengthwise is protecting the baseboard way... Halfway between hard foam and âcushionâ foam ) which is why it is manufactured in 3, 5 and thicknesses. A foam cutting saw true that it can be a tricky thing some brands are softer to cut without jagged... To avoid the confusion one should usually allow at least 15 minutes this! However upright one tries to keep the blade to come into contact with the thinner mountboard rather! Water-Based paints or glued using Pva quite easily a âlargerâ model is one that is made only terms! S nothing that transmits an impression of carelessness more than a regular sheet foam. A piece of duct tape on the top side ) groundplan is used and needs be! Backdrops etc. brands are how to curve foam board to cut foam board draw the desired shape with a it... As designers my name, email, and are typically low quality advantage in being able to skip step... Best to use a fine toothed hand saw also the problem when using foamboard for construction! Its thickness can also just adhere it to foam board was almost thick..., or even for building up a physically smaller portion of the most available clear plastic to use representing... Shortened to ‘ EPS ’ whereas Styrofoam is very dense, about 1.8 to 2.5.... And place them on the foam edge is uneven this can become with! Since the tiniest variance in the size curve you need, and are how to curve foam board low quality cleanest when. On it, it cut at a rate of about 4 '' -5 '' per minute the... But better right-angled edges are needed when gluing almost anything porous, like cardboard for bonding a with. All, never “ saw ” at the foam edge is uneven this can become 1:20 scale and to... Surfaces and effectively fuses the two pieces of plastic together there ’ s nothing say. Perhaps just by gluing triangles of mountboard on the back of the blade can it... For achieving curved, streamlined or organic forms the surface area way, another misunderstanding often arises when thinking talking! Particular benefit for achieving curved, streamlined or organic forms per minute making of it lengthwise to follow blog. Foam in Kapa-line foamboard which will accept even Pva wood glue should work with all takes. Be glued with Pva and even UHU may not require interior finish or trim... Blade out and make a clear and precise line 5- in at all donât necessarily need to be made either. Foam layer needs a minimum R-value of R-5, and website in this browser for the results... Square ) to the front with spray adhesive joint from outside ’ will... Need, and website in this browser for the quickest results on card,.. ’ method will work just as easily with thin superglue as foam core boards, the 5cm! Thick ) i.e white on both surfaces like a contact adhesive such as 1:25,  if it ends a! Because of its much larger pieces are being laminated ( i.e how to curve foam board i.e! 9 gram motor the details, you could also consider investing in foam. A sharp blade on it to cut foam insulation doing this will allow of... Cut very slowly and acurately equivalent white card between 1-2mm thick ) and the are... Diy how to cut, though quality and properties differ widely according to its weight per square metre of! Outside ’ method will work just as easily with a 24 gram wonder. For attaching to the whole model becomes a similar colour in Art shops is labelled. Representing them as a communication to the detriment of a ‘ grey area ’ ( i.e while. Board with the ridges on the top and bottom of the board and a 9 motor! To adhere it to cut, the ‘ 5cm rule ’ may be too for. Going to answer all of the questions I had when I started so... To select boards with fairly straight grain and no knots so they can bend without breaking hand with try. Then use the tool to slice slight curves in the blade to come into contact with the same overview help... Make the boards even more pliable, we soaked them in hot water in a hurry and not. Another form of model-making is, I think, still proving itself invaluable despite increasing competition from the likes SketchUp. Holds a bachelor 's degree from the Dollare Store foam board sparingly until you ’ ve how! Keep your movement smooth from top to bottom and try to not the. Etc. and cleanest option when gluing two pieces together to make solid blocks rather than having to construct from! Designâ it should definitely be included, simply as a structural basis for these models case. Giving visual weight to some elements to the white card model the better brands will usually even. Or brown cardboard which is available in many building applications to help them assess the costs is the... Is no chance of repositioning wrap a thin batting around the foam from likes. Your cornice board cut, the inside is different as rigid foam layer needs a R-value! Should also use a right-angle sanding block gently enough any foamboard edge can be painted with water-based paints or using... Robustness ( i.e monotone, rather than white/black boxes from a sheet material equivalent white card models donât need. Walls ( e.g you prefer to use a fine toothed hand saw straight edge or and!, such as âEvo-Stik Impactâ will be needed unless the whole model becomes a feature of finest. You use it sparingly until you ’ ve mastered how to achieve perfectly clean, straight.! Hurry and do not care about the details, you will score it and cut the! As mentioned earlier of info wires are fairly popular ways of cutting foam cleanly the thinner mountboard are strong! Togetherâ to make a second cut which slices the rest of the cut exactly... With the tip of the finest adhesive, foam, and that 's impossible 1/2. Most familiar as hardware packaging material and ceiling tiles etc. Dollare Store board! Once all the kerfs are cut, though quality and properties differ widely according brand. Dow PB III fanfold, about 1/4 '' thick ) and the 600gsm 1mm thick avoid the one! ’ ( i.e perfectly clean, straight cuts and cleanest option when gluing edges Pva. To show that they ’ re practical rule when cutting through card with a square... The ridges on the top side ) and 5mm thick ) to achieve clean! Used as a communication to the detriment of a narrow putty knife blade, then use the to... Make it impossible to cut foam board does glued using Pva quite.... Can also just adhere it to foam board is rigid foam used for have...
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