The automotive application of FRP/foam composite was pioneered in the 1970’s by the author’s former design firm, Quincy-Lynn Enterprises, Inc. We used polyester resin and glass cloth laminations over a core of rigid urethane foam boardstock (fiberglass over foam). Will let this cure 12 hrs then lay another layer of mat to make the mold stiffer. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. It may seem like they do, but will quickly delaminate from one another causing a failure. Westbrook, CT (The Asshole State), Portsmouth NH, boating out of the mighty Merrimack, TUFF-R R-12.2 1-7/8 in. Make sure that you have enough epoxy to account for pouring over sides and edges, covering objects, filling in cracks and holes, or any other factor that would require additional epoxy. And yes, it is a nice turd. I will assume you mean EPS foam, aka polystyrene foam or Styrofoam (a trade name). Also, non-artistic builders find it intimidating to sculpt the shapes freehand. Foam normally doesn t have a problem with epoxy. It may not display this or other websites correctly. It's known for being more responsive in its performance but it also (over time) absorbs water and yellows. Use a razor knife to cut the mat. Thought the wax would block any migration of resin. Same board, different constructions. Polystyrene foam will definitely melt in the presence of polyester resin. The foam provides strength, buoyancy, and sound deadening. Until recently, producing a single, functional part from composite materials was impractical. If the foam gets eaten, or if you wanted to use polyester resin you just thin out some white glue (Elmer s) with water and brush it on the foam. Polyester: This is the resin most commonly used for boatbuilding today, and most boat owners are familiar with it. Use a notched trowel to apply a layer to the foam plank surface. Spraying PVA over the wax would block any reactivity issues. I used the blue Dow foam boards on my fish box poly resin sticks nicely, actually the mekp eats the foam (stryfoam derivatives). Polyester Resin Characteristics: Polyester resin is brittle and prone to micro-cracking. This special polyester resin does not chemically attack EPS foam, but bonds, and creates a barrier. x 4 ft. x 8 ft. R9.4 Thermasheath 3 Insulation-W-N5150 at The Home Depot, Super TUFF-R R8.3 1-3/8 in. Figures I have plenty of boatyard polyester resin on hand and no epoxy resin LOL, The yellow normally has a foil facing on both sides. Short answer: because looking sideways at polystyrene will melt it. For example, the user can add an inhibitor to the resin to increase the so … We call it EPS-Coat (Ce-Sense). Celotex is the brand we get. We can buy several densities of EPS foam. Other than that, you are pretty much out of the foamie materials. Need to make a plug with compound curves and don't know what foam is OK to use with a polyester resin. Foam Insulation-268441 at The Home Depot, 1-1/2 in. #77 Polyester Molding Resin is a wax-free, general purpose fiberglass resin. Glue the planks together with a mixture of 105 Resin and 206 Hardener, thickened with 410 Microlight® fairing compound. JUST BE WARNED home depot pink foam has NO density to it and will provide no structural support nor … Epoxy may cost a bit more - but it is worth it. You can vary the cure time of polyester resin by adding more or less of MEKP catalyst. That says - no dirt, dust, wax, adhesive, sealant, grease or anything else. #90 Isophthalic Polyester Resin is a durable, dimensionally stable, corrosion resistant resin. Use a notched trowel adhesive spreader to apply it so you end up with lots of tiny lines of glue on the ply, then flip it over onto the foam and press it until cure. Lay the next foam plank on the thickened mixture and coat its top surface. 5 coats of spray polyurethane followed by 4 coats of partall wax. Shot a full coat of PVA earlier then laid the first layer of mat/polyester resin. Polyurethane surfboard blanks can be glassed with either polyester or epoxy resin, making it versatile in terms of giving riders more options. Once cured, StyroSafe protects EPS foam from chemical attack from general purpose unsaturated polyester resins or styrene-containing coatings. And remember, epoxy will adhere to basically anything clean - whereas polyester does not do the job as epoxy. Be cautious with using epoxy resins over or near polyester resins as they are not compatable and will never bond to each other. StyroSafe Polyester Resin (30P-106A) is designed specifically for use on expanded polystyrene foam. It is compatible with most resin systems and is fire retardant. Epoxy like West system correct? PU casting resins can, just like epoxy resin and polyester resin, be combined with various additives as well as filling materials or colorants. Wax provides slip but is unable to block any chemical reactivity. Polyester foam core is a closed cell, dimensionally stable core with a wide range of densities. Rigid-hulled boats. Polyester resin generally costs slightly less than epoxy resin. May have to drill a small hole somewhere in the mold so I can put some high PSI air to it. Also, the chemistry of epoxy is different than that of polyester resin, so does PVA have the same chemical reaction with epoxy or is it just a mold release agent when used in epoxy molds? x 4 ft. x 8 ft. The mat is laid over the top only. Polyester resin will eat the foam. That's pretty much all I … Some boat hulls have a rigid polyurethane foam core sandwiched between fiberglass skins. NO room for much stuff in the fuselage! The foam core, or blank, is formed in a large, cement mold roughly the shape of the surfboard. I've never tried to release off of polyurethane. As an insulation foam it has a slightly higher R value [ 7 per inch vs 6 ] than polystyrene insulation foams. On the same note, will Gel coat 'stick' to aluminum? For example, a vinylester resin is ideal for S-glass but, when used with E-glass, the reinforcing material will fail before the resin. It’s a little stronger than and also more flexible, allowing it to snap back into shape better than Polyester which is a little more brittle and can lead to cracking. Fortunately, we have a couple of products you can use to still make it work. Sanded smooth down to 1500 grit sandpaper. Whats the best way to bond foam board togather and the proper resin to glass over it? The ‘head’ on the right above was painted with a small amount of Tomps Fast Cast polyurethane resin, first mixed together quickly and then worked with a soft brush into the styrofoam surface. Whats the closest to shore you've ever caught a tuna? Thanks! Urethane foams are not affected by styrene and therefore can be covered with polyester resin. However, polyester resin will work perfectly on polyurethane foam and, with predictable logic, polyurethane resin works perfectly on polystyrene foams such as styrofoam! Cut the layers of fiberglass mat to the specific size that is needed. The stuff I have used comes with a foil skin on both sides, haven't seen it without that. groper , Nov 19, 2018 #9 If in doubt, you can always try an experiment and squirt a blob of foam on a scrap of wood or cardboard and let it cure. This video explains the difference betweet polyester and epoxy resin, and how to use them, and when to use polyester or epoxy. I would start with Grant s suggestion and try a little piece of foam with the resin of your choice. I have some PVA, Will do that first. It may react with the layup resin. x 4 ft. x 8 ft. No, the foil stays. Some here in WI might think it was a funny looking sausage, http://www.fibreglast.com/product/Po...heets_440/Foam, http://www.fibreglast.com/product/6-...heets-448/Foam, http://www.rexco-usa.com/why-molds-stick/, Composite :: Epoxy Resin or Polyester Resin, Polyester resin and EPO (fiberglass resin), The following errors occurred with your submission. You're encapsulating the foam anyways (or should be) so all you really need, regardless of the foam, is a barrier that won't degrade by the resin. Polyester resin will eat it up. Much of the problem was due to the rough and wavy surface that usually resulted when these materials were not used inside a mold. Also, not all blue foams are the same. Modern variations sometimes use an epoxy resin or vinyl-ester resin and carbon-fiber-cloth over urethane … Epoxy resin is the only resin that can be used on EPS foam. 6. actually the mekp eats the foam (stryfoam derivatives) dont have to worry about it with polyurethane foams and pvc foams. Lot of artists use it, but also technical products are made with it. Julian Wilson boosting on his JS - Air 17 in PU and Air 17 Hyfi (EPS Construction). Problem with polyester resin over foam any chemical reactivity materials are formulated to be used over.! 1-1/2 in make a plug with compound curves and do not contain styrene and can be used EPS. The general size and shape you need that says - no dirt, dust,,... Then laid the first product is an FGCI product called Styrocoat that uses a standard epoxy activator and will a... Mat for this to Styrofoam, as it will melt the foam,,! 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