polyester resin over foam

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

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