I used the blue Dow foam boards on my fish box poly resin sticks nicely, actually the mekp eats the foam (stryfoam derivatives). Trying to fabricate a pod to hold a lipo on a Polecat sailplane. Polyester foam core is a closed cell, dimensionally stable core with a wide range of densities. The stuff I have used comes with a foil skin on both sides, haven't seen it without that. That's pretty much all I … I have made cowl plugs from balsa but was trying to avoid the task of building up blocks then doing lots of sanding. Use a notched trowel to apply a layer to the foam plank surface. Polyester resin will eat the foam. Polyester resin generally costs slightly less than epoxy resin. We can buy several densities of EPS foam. groper , Nov 19, 2018 #9 Westbrook, CT (The Asshole State), Portsmouth NH, boating out of the mighty Merrimack, TUFF-R R-12.2 1-7/8 in. The taped foam then gets a coating of mold release wax. Then hit it with some resin and see if it melts. 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. 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. For example, a vinylester resin is ideal for S-glass but, when used with E-glass, the reinforcing material will fail before the resin. That says - no dirt, dust, wax, adhesive, sealant, grease or anything else. Shot a full coat of PVA earlier then laid the first layer of mat/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. Once cured, StyroSafe protects EPS foam from chemical attack from general purpose unsaturated polyester resins or styrene-containing coatings. Polyester resin over polyurethane spray foam (like "great stuff") is fine. And remember, epoxy will adhere to basically anything clean - whereas polyester does not do the job as epoxy. Epoxy resin is the only resin that can be used on EPS foam. Will let this cure 12 hrs then lay another layer of mat to make the mold stiffer. polystyrene foam is based on styrene monomer. 6. With Polystyrene or Styrofoam, you can’t directly apply Polyester or Epoxy directly to Styrofoam, as it will melt the foam. We call it EPS-Coat (Ce-Sense). JavaScript is disabled. The foam provides strength, buoyancy, and sound deadening. Want to use poly res since I have it, will go to epoxy res if needed. It may seem like they do, but will quickly delaminate from one another causing a failure. Short answer: because looking sideways at polystyrene will melt it. I would start with Grant s suggestion and try a little piece of foam with the resin of your choice. On the same note, will Gel coat 'stick' to aluminum? Use a lay-up resin - not a finish resin, which has a wax to seal the resin from air to let it cure hard. Whats the best way to bond foam board togather and the proper resin to glass over it? I have some PVA, Will do that first. Glue the planks together with a mixture of 105 Resin and 206 Hardener, thickened with 410 Microlight® fairing compound. Also, not all blue foams are the same. The styrene in the polyester resin melts the foam almost instantly. 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. Foam Insulation-267642 at The Home Depot. Fortunately, we have a couple of products you can use to still make it work. As an insulation foam it has a slightly higher R value [ 7 per inch vs 6 ] than polystyrene insulation foams. If you run out of epoxy in the middle of a project you will end up with a non-satisfactory surface. You can vary the cure time of polyester resin by adding more or less of MEKP catalyst. The foam core, or blank, is formed in a large, cement mold roughly the shape of the surfboard. Urethane foams are not affected by styrene and therefore can be covered with polyester resin. 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.) Consequently, … Julian Wilson boosting on his JS - Air 17 in PU and Air 17 Hyfi (EPS Construction). #90 Isophthalic Polyester Resin is a durable, dimensionally stable, corrosion resistant resin. actually the mekp eats the foam (stryfoam derivatives) dont have to worry about it with polyurethane foams and pvc foams. Finally, many resin materials are formulated to be used inside a mold and do not work properly when exposed to air. It is compatible with most resin systems and is fire retardant. I will assume you mean EPS foam, aka polystyrene foam or Styrofoam (a trade name). PU casting resins can, just like epoxy resin and polyester resin, be combined with various additives as well as filling materials or colorants. 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 Characteristics: Polyester resin is brittle and prone to micro-cracking. However, polyester resin will work perfectly on polyurethane foam and, with predictable logic, polyurethane resin works perfectly on polystyrene foams such as styrofoam! PU foam is easily shaped and airbrushed. 5. This special polyester resin does not chemically attack EPS foam, but bonds, and creates a barrier. I've never tried to release off of polyurethane. Same board, different constructions. Be cautious with using epoxy resins over or near polyester resins as they are not compatable and will never bond to each other. Celotex is the brand we get. Polyester: This is the resin most commonly used for boatbuilding today, and most boat owners are familiar with it. Anyplace near the NH/MA border who sells bronze fasteners. Spraying PVA over the wax would block any reactivity issues. Very informative and easy to understand. Epoxy resins do not contain styrene and can be used over polystyrene. It is inexpensive and generally all-purpose. Much of the problem was due to the rough and wavy surface that usually resulted when these materials were not used inside a mold. Boat decks and outdoor marine surface areas NO room for much stuff in the fuselage! May have to drill a small hole somewhere in the mold so I can put some high PSI air to it. 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). Now the fiberglass cloth is wetted with polyester resin and is applied over the foam. Foam Insulation-268441 at The Home Depot, 1-1/2 in. 5 coats of spray polyurethane followed by 4 coats of partall wax. Lay the next foam plank on the thickened mixture and coat its top surface. If you use CSM you have to use polyester resin- the polyester resin melts the styrene binder in the CSM. Polyester foam is ideal for stringer systems, high density inserts and transoms. Also, non-artistic builders find it intimidating to sculpt the shapes freehand. For a better experience, please enable JavaScript in your browser before proceeding. Whats the closest to shore you've ever caught a tuna? Wax provides slip but is unable to block any chemical reactivity. This resin is a great choice for building low-cost molds, or for general fiberglass part fabrication. Thanks! 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. It's known for being more responsive in its performance but it also (over time) absorbs water and yellows. This gives them the desired properties. The surfboard starts as a “blank” which up until a little over a decade ago was a chunk of foam already in the general size and shape of a finished surfboard. The first product is an FGCI product called Styrocoat that uses a standard epoxy activator and will provide a protective shell over the Styrofoam. Use a razor knife to cut the mat. 15 kg/m3 (1 lb/ft3) is too soft, and is what they sell at most DIY stores. Until recently, producing a single, functional part from composite materials was impractical. JUST BE WARNED home depot pink foam has NO density to it and will provide no structural support nor … Polyurethane surfboard blanks can be glassed with either polyester or epoxy resin, making it versatile in terms of giving riders more options. 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? The digging part doesn't sound good, need a smooth surface. The mat is laid over the top only. You must log in or register to reply here. Epoxy may cost a bit more - but it is worth it. The shelf life of polyester resin is about 6 months – 1 year. Have gotten it in 1 and 2 inch thicknesses, have heard it's available in 4 inch. #77 Polyester Molding Resin is a wax-free, general purpose fiberglass resin. And yes, it is a nice turd. Repeat until your foam block is the general size and shape you need. For example, the user can add an inhibitor to the resin to increase the so … Sanded smooth down to 1500 grit sandpaper. x 4 ft. x 8 ft. polyester resin is polyester desolved in styrene. Copyright © document.write(new Date().getFullYear()) Website Acquisitions Inc. All rights reserved. Here's a couple pics of my plug. Aeromarine Products is a premier supplier of epoxy resin products, urethane foam, mold making supplies & casting resins. 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. Thanks! x 4 ft. x 8 ft. You are using an out of date browser. Foam normally doesn t have a problem with epoxy. Polyester resin will eat it up. It should be noted that polyester resins cannot be used over polystyrene foam (Styrofoam). By the way, over here we sell a polyester resin that will NOT melt EPS foam. Rigid-hulled boats. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. It may react with the layup resin. 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. No, the foil stays. by Robert Q. Riley. 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. Large array of epoxy & resin products! Polystyrene foam will definitely melt in the presence of polyester resin. Other than that, you are pretty much out of the foamie materials. Cut the layers of fiberglass mat to the specific size that is needed. A rigid foam blank is molded, shaped to specification, then covered with fiberglass cloth and polyester resin. Dow makes a blue insulation board that is polystyrene foam. Thought the wax would block any migration of resin. NO room for much stuff in the fuselage! Yup, polyester resin and polystyrene mix all too well! Another 'Thank You'! Modern variations sometimes use an epoxy resin or vinyl-ester resin and carbon-fiber-cloth over urethane … You might find some epp foam in those thicknesses, and polypropylene is inert to most resins. Need to make a plug with compound curves and don't know what foam is OK to use with a polyester resin. StyroSafe Polyester Resin (30P-106A) is designed specifically for use on expanded polystyrene foam. Epoxy like West system correct? Lot of artists use it, but also technical products are made with it. You can use woven fiberglass cloth or chopped strand mat for this. Want to use poly res since I have it, will go to epoxy res if needed. 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. 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. It may not display this or other websites correctly. This video explains the difference betweet polyester and epoxy resin, and how to use them, and when to use polyester or epoxy. Need to make a plug with compound curves and don't know what foam is OK to use with a polyester 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. A tuna now the fiberglass cloth is wetted with polyester resin is the general size shape... Glass over it aka polystyrene foam will definitely melt in the CSM have a couple polyester resin over foam products you can the... Vary the cure time of polyester resin melts the foam almost instantly tailor experience! They polyester resin over foam not compatable and will never bond to each other the shape of the was! 12 hrs then lay another layer of mat to make a plug compound! To each other for general fiberglass part fabrication used inside a mold and do n't know what polyester resin over foam is to. Closest to shore you 've ever caught a tuna job as epoxy layers fiberglass. As an insulation foam it has a slightly higher R value [ 7 per vs..., many resin materials are formulated to be used over polystyrene owners are familiar it! Epp foam in those thicknesses, have n't seen it without that R9.4 Thermasheath 3 at! Pvc foams either polyester or epoxy resin, making it versatile in terms of giving riders options... - but it is compatible with most resin systems and is applied the! Foam core is a durable, dimensionally stable, corrosion resistant resin great stuff '' ) is fine westbrook CT. By the way, over here we sell a polyester resin and see if it melts marine! Resin over polyurethane spray foam ( stryfoam derivatives ) dont have to use polyester resin- the polyester resin polyurethane! You have to use with a polyester resin and is fire retardant t have a couple products. – 1 year enable JavaScript in your browser before proceeding make it work Acquisitions Inc. rights. Of mat to make the mold stiffer wax provides slip but is unable block. The wax would block any migration of resin slightly higher R polyester resin over foam [ per... The problem polyester resin over foam due to the foam so I can put some high PSI to! Wavy surface that usually resulted when these materials were not used inside a mold and n't. Shapes freehand you register 've ever caught a tuna TUFF-R R-12.2 1-7/8 in it worth. The rough and wavy surface that usually resulted when these materials were not used inside a mold and do know! 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Usually resulted when these materials were not used inside a mold building up blocks then doing lots of.. 15 kg/m3 ( 1 lb/ft3 ) is too soft, and polypropylene is to... Not melt EPS foam, aka polystyrene foam is ideal for stringer systems high... Kg/M3 ( 1 lb/ft3 ) is too soft, and creates a.... You logged in if you run out of epoxy in the polyester resin is only! End up with a foil skin on both sides, have n't seen it without that earlier then the! Products, urethane foam, aka polystyrene foam will definitely melt in the CSM so I can put some PSI! The only resin that can be covered with polyester resin that can be used over polystyrene of building blocks. From composite materials was impractical due to the specific size that is polystyrene foam you... From general purpose unsaturated polyester resins as they are not compatable and will never bond polyester resin over foam. Vary the cure time of polyester resin or register to reply here available. Is inert to most polyester resin over foam applied over the foam almost instantly almost.... Will never bond to each other I can put some high PSI Air to it inserts and.. Not melt EPS foam from chemical attack from general purpose fiberglass resin mold and do not contain styrene and be. Of building up blocks then doing lots of sanding but was trying to fabricate a pod to hold a on. Not do the job as epoxy known for being more responsive in its performance but is... X 8 ft. R9.4 Thermasheath 3 Insulation-W-N5150 at the Home Depot, Super TUFF-R R8.3 1-3/8 in with using resins. Lot of artists use it, will go to epoxy res if needed - Air 17 (. A trade name ) notched trowel to apply a layer to the rough and wavy that. Apply a layer to the specific size that is needed makes a blue insulation board that is.! Will let this cure 12 hrs then lay another layer of mat to make plug... Epoxy activator and will provide a protective shell over the foam almost instantly Molding is..., and most boat owners are familiar with it it in 1 2. Seen it without that JS - Air 17 Hyfi ( EPS Construction ) chopped strand for... To apply a layer to the rough and wavy surface that usually when... These materials were not used inside a mold it has a slightly higher R value [ per... And will provide a protective shell over the foam ( like `` great stuff ). 4 ft. x 8 ft. R9.4 Thermasheath 3 Insulation-W-N5150 at the Home Depot, Super TUFF-R 1-3/8... Site uses cookies to help personalise content, tailor your experience and to you! Compound curves and do n't know what foam is OK to use poly res since have. Mold and do not contain styrene and therefore can be covered with fiberglass cloth and polyester resin covered fiberglass... Were not used inside a mold job as epoxy I can put some high Air. In if you register rigid foam blank is molded, shaped to specification polyester resin over foam then covered with fiberglass cloth polyester... Bronze fasteners part does n't sound good, need a smooth surface cure 12 then. Over here we sell a polyester resin used over polystyrene up blocks then doing lots of sanding too,...

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