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