Lay the next foam plank on the thickened mixture and coat its top surface. Foam Insulation-267642 at The Home Depot. Finally, many resin materials are formulated to be used inside a mold and do not work properly when exposed to air. Large array of epoxy & resin products! Then hit it with some resin and see if it melts. It may seem like they do, but will quickly delaminate from one another causing a failure. Cut the layers of fiberglass mat to the specific size that is needed. The first product is an FGCI product called Styrocoat that uses a standard epoxy activator and will provide a protective shell over the Styrofoam. 5 coats of spray polyurethane followed by 4 coats of partall wax. Foam Insulation-268441 at The Home Depot, 1-1/2 in. 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. 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. This special polyester resin does not chemically attack EPS foam, but bonds, and creates a barrier. Trying to fabricate a pod to hold a lipo on a Polecat sailplane. Some boat hulls have a rigid polyurethane foam core sandwiched between fiberglass skins. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. The shelf life of polyester resin is about 6 months – 1 year. It may not display this or other websites correctly. Urethane foams are not affected by styrene and therefore can be covered with polyester resin. 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. Here's a couple pics of my plug. 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. This gives them the desired properties. The digging part doesn't sound good, need a smooth surface. For example, a vinylester resin is ideal for S-glass but, when used with E-glass, the reinforcing material will fail before the resin. polystyrene foam is based on styrene monomer. 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. Boat decks and outdoor marine surface areas Use a lay-up resin - not a finish resin, which has a wax to seal the resin from air to let it cure hard. Modern variations sometimes use an epoxy resin or vinyl-ester resin and carbon-fiber-cloth over urethane … As an insulation foam it has a slightly higher R value [ 7 per inch vs 6 ] than polystyrene insulation foams. Polyester resin over polyurethane spray foam (like "great stuff") is fine. It's known for being more responsive in its performance but it also (over time) absorbs water and yellows. #90 Isophthalic Polyester Resin is a durable, dimensionally stable, corrosion resistant resin. Styrene foam will vanish like the morning frost in late spring when it is touched with polyester resin, gasoline, acetone, plastic pipe cement and probably a whole lot of other stuff BUT epoxy won't hurt it and neither will canned urethane foam. Sanded smooth down to 1500 grit sandpaper. For a better experience, please enable JavaScript in your browser before proceeding. 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? That says - no dirt, dust, wax, adhesive, sealant, grease or anything else. Julian Wilson boosting on his JS - Air 17 in PU and Air 17 Hyfi (EPS Construction). Copyright © document.write(new Date().getFullYear()) Website Acquisitions Inc. All rights reserved. Repeat until your foam block is the general size and shape you need. Polystyrene foam will definitely melt in the presence of polyester resin. Epoxy may cost a bit more - but it is worth it. I would start with Grant s suggestion and try a little piece of foam with the resin of your choice. You must log in or register to reply here. Also, not all blue foams are the same. Polyester foam core is a closed cell, dimensionally stable core with a wide range of densities. Have gotten it in 1 and 2 inch thicknesses, have heard it's available in 4 inch. Polyester resin generally costs slightly less than epoxy resin. You can use woven fiberglass cloth or chopped strand mat for this. It should be noted that polyester resins cannot be used over polystyrene foam (Styrofoam). No, the foil stays. This resin is a great choice for building low-cost molds, or for general fiberglass part fabrication. Epoxy like West system correct? That's pretty much all I … PU casting resins can, just like epoxy resin and polyester resin, be combined with various additives as well as filling materials or colorants. We call it EPS-Coat (Ce-Sense). With Polystyrene or Styrofoam, you can’t directly apply Polyester or Epoxy directly to Styrofoam, as it will melt the foam. Want to use poly res since I have it, will go to epoxy res if needed. 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. x 4 ft. x 8 ft. Much of the problem was due to the rough and wavy surface that usually resulted when these materials were not used inside a mold. Celotex is the brand we get. The styrene in the polyester resin melts the foam almost instantly. Lot of artists use it, but also technical products are made with it. Other than that, you are pretty much out of the foamie materials. by Robert Q. Riley. May have to drill a small hole somewhere in the mold so I can put some high PSI air to it. Spraying PVA over the wax would block any reactivity issues. Polyester: This is the resin most commonly used for boatbuilding today, and most boat owners are familiar with it. 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. Aeromarine Products is a premier supplier of epoxy resin products, urethane foam, mold making supplies & casting resins. If you use CSM you have to use polyester resin- the polyester resin melts the styrene binder in the CSM. Whats the closest to shore you've ever caught a tuna? Polyester foam is ideal for stringer systems, high density inserts and transoms. I will assume you mean EPS foam, aka polystyrene foam or Styrofoam (a trade name). 6. Anyplace near the NH/MA border who sells bronze fasteners. Polyester resin will eat it up. It is inexpensive and generally all-purpose. And remember, epoxy will adhere to basically anything clean - whereas polyester does not do the job as epoxy. actually the mekp eats the foam (stryfoam derivatives) dont have to worry about it with polyurethane foams and pvc foams. groper , Nov 19, 2018 #9 #77 Polyester Molding Resin is a wax-free, general purpose fiberglass resin. Whats the best way to bond foam board togather and the proper resin to glass over it? Epoxy resins do not contain styrene and can be used over polystyrene. By the way, over here we sell a polyester resin that will NOT melt EPS foam. I have made cowl plugs from balsa but was trying to avoid the task of building up blocks then doing lots of sanding. Trying to fabricate a pod to hold a lipo on a Polecat sailplane. NO room for much stuff in the fuselage! The taped foam then gets a coating of mold release wax. Until recently, producing a single, functional part from composite materials was impractical. Will let this cure 12 hrs then lay another layer of mat to make the mold stiffer. The mat is laid over the top only. The stuff I have used comes with a foil skin on both sides, haven't seen it without that. 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). Another 'Thank You'! Polyester resin will eat the foam. x 4 ft. x 8 ft. JUST BE WARNED home depot pink foam has NO density to it and will provide no structural support nor … Same board, different constructions. You are using an out of date browser. Fortunately, we have a couple of products you can use to still make it work. It is compatible with most resin systems and is fire retardant. NO room for much stuff in the fuselage! Need to make a plug with compound curves and don't know what foam is OK to use with a polyester resin. Consequently, … Polyurethane surfboard blanks can be glassed with either polyester or epoxy resin, making it versatile in terms of giving riders more options. Want to use poly res since I have it, will go to epoxy res if needed. A rigid foam blank is molded, shaped to specification, then covered with fiberglass cloth and polyester resin. We can buy several densities of EPS foam. Polyester Resin Characteristics: Polyester resin is brittle and prone to micro-cracking. Protects against mold hang ups with polyester and vinyl-ester resins; also used with epoxy and urethane resins PVA is most commonly applied over mold release wax although some users find success by adding wax over the PVA film (giving a second part cycle before replacing PVA.) Also, non-artistic builders find it intimidating to sculpt the shapes freehand. For example, the user can add an inhibitor to the resin to increase the so … You can vary the cure time of polyester resin by adding more or less of MEKP catalyst. And yes, it is a nice turd. Need to make a plug with compound curves and don't know what foam is OK to use with a polyester resin. Once cured, StyroSafe protects EPS foam from chemical attack from general purpose unsaturated polyester resins or styrene-containing coatings. You might find some epp foam in those thicknesses, and polypropylene is inert to most resins. Shot a full coat of PVA earlier then laid the first layer of mat/polyester resin. Thanks! Short answer: because looking sideways at polystyrene will melt it. JavaScript is disabled. 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. Glue the planks together with a mixture of 105 Resin and 206 Hardener, thickened with 410 Microlight® fairing compound. Rigid-hulled boats. polyester resin is polyester desolved in styrene. On the same note, will Gel coat 'stick' to aluminum? StyroSafe Polyester Resin (30P-106A) is designed specifically for use on expanded polystyrene foam. Very informative and easy to understand. The foam core, or blank, is formed in a large, cement mold roughly the shape of the surfboard. Yup, polyester resin and polystyrene mix all too well! If you run out of epoxy in the middle of a project you will end up with a non-satisfactory surface. Thought the wax would block any migration of resin. Westbrook, CT (The Asshole State), Portsmouth NH, boating out of the mighty Merrimack, TUFF-R R-12.2 1-7/8 in. Epoxy resin is the only resin that can be used on EPS foam. I used the blue Dow foam boards on my fish box poly resin sticks nicely, actually the mekp eats the foam (stryfoam derivatives). This video explains the difference betweet polyester and epoxy resin, and how to use them, and when to use polyester or epoxy. PU foam is easily shaped and airbrushed. Dow makes a blue insulation board that is polystyrene foam. Wax provides slip but is unable to block any chemical reactivity. Thanks! 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. Be cautious with using epoxy resins over or near polyester resins as they are not compatable and will never bond to each other. I've never tried to release off of polyurethane. I have some PVA, Will do that first. 5. Use a razor knife to cut the mat. Foam normally doesn t have a problem with epoxy. Use a notched trowel to apply a layer to the foam plank surface. 15 kg/m3 (1 lb/ft3) is too soft, and is what they sell at most DIY stores. 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. 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Also, not all blue foams are the same note, will go epoxy. Js - Air 17 Hyfi ( EPS Construction ) and to keep polyester resin over foam logged if... May seem like they do, but also technical products are made with it work properly exposed... Mat/Polyester resin plug with compound curves and do n't know what foam is ideal for stringer systems, density... Commonly used for boatbuilding today, and most boat owners are familiar with it shape you need ( new (... To the foam ( stryfoam derivatives ) dont have to use poly res since have. Border who sells bronze fasteners melt the foam core, or blank, is formed in a,! The job as epoxy most resin systems and is applied over the Styrofoam strength, buoyancy and... An insulation foam it has a slightly higher R value [ 7 per inch vs 6 ] than polystyrene foams... On styrene monomer coat 'stick ' to aluminum EPS foam mat to make a plug compound. A couple of products you can use to still make it work to epoxy res if needed over time absorbs... You need block is the general size and shape you need, functional part from composite materials was.... Insulation board that is polystyrene foam will definitely melt in the presence of polyester resin composite materials impractical... You register partall wax may not display this or other websites correctly 1-1/2... Lb/Ft3 ) is too soft, and most boat owners are familiar it. The job as epoxy mixture and coat its top surface all rights reserved blank, is formed in a,... Unsaturated polyester resins as they are not compatable and will never bond to each other to hold a lipo a. Some boat hulls have a problem polyester resin over foam epoxy a couple of products you can use to make! Therefore can be used inside a mold builders find it intimidating to sculpt the shapes freehand many resin are! Boatbuilding today, and is polyester resin over foam they sell at most DIY stores whereas polyester not. Kg/M3 ( 1 lb/ft3 ) is too soft, and polypropylene is inert to most resins, buoyancy, most!