StyroSafe Polyester Resin (30P-106A) is designed specifically for use on expanded polystyrene foam. This special polyester resin does not chemically attack EPS foam, but bonds, and creates a barrier. The digging part doesn't sound good, need a smooth surface. The foam provides strength, buoyancy, and sound deadening. I will assume you mean EPS foam, aka polystyrene foam or Styrofoam (a trade name). Westbrook, CT (The Asshole State), Portsmouth NH, boating out of the mighty Merrimack, TUFF-R R-12.2 1-7/8 in. And yes, it is a nice turd. 15 kg/m3 (1 lb/ft3) is too soft, and is what they sell at most DIY stores. Wax provides slip but is unable to block any chemical reactivity. Anyplace near the NH/MA border who sells bronze fasteners. 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. You can use woven fiberglass cloth or chopped strand mat for this. Need to make a plug with compound curves and don't know what foam is OK to use with a polyester resin. by Robert Q. Riley. Consequently, … Finally, many resin materials are formulated to be used inside a mold and do not work properly when exposed to air. groper , Nov 19, 2018 #9 Glue the planks together with a mixture of 105 Resin and 206 Hardener, thickened with 410 Microlight® fairing compound. Foam Insulation-267642 at The Home Depot. 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 styrene in the polyester resin melts the foam almost instantly. #90 Isophthalic Polyester Resin is a durable, dimensionally stable, corrosion resistant resin. Aeromarine Products is a premier supplier of epoxy resin products, urethane foam, mold making supplies & casting resins. Foam Insulation-268441 at The Home Depot, 1-1/2 in. I have some PVA, Will do that first. A rigid foam blank is molded, shaped to specification, then covered with fiberglass cloth and polyester resin. #77 Polyester Molding Resin is a wax-free, general purpose fiberglass resin. If you run out of epoxy in the middle of a project you will end up with a non-satisfactory surface. I have made cowl plugs from balsa but was trying to avoid the task of building up blocks then doing lots of sanding. Until recently, producing a single, functional part from composite materials was impractical. Shot a full coat of PVA earlier then laid the first layer of mat/polyester resin. With Polystyrene or Styrofoam, you can’t directly apply Polyester or Epoxy directly to Styrofoam, as it will melt the foam. Need to make a plug with compound curves and don't know what foam is OK to use with a polyester resin. That says - no dirt, dust, wax, adhesive, sealant, grease or anything else. 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. Thanks! Polyester foam is ideal for stringer systems, high density inserts and transoms. Polyester resin generally costs slightly less than epoxy resin. Much of the problem was due to the rough and wavy surface that usually resulted when these materials were not used inside a mold. 5. This gives them the desired properties. We call it EPS-Coat (Ce-Sense). Urethane foams are not affected by styrene and therefore can be covered with polyester resin. It may react with the layup resin. Trying to fabricate a pod to hold a lipo on a Polecat sailplane. May have to drill a small hole somewhere in the mold so I can put some high PSI air to it. Also, not all blue foams are the same. Epoxy may cost a bit more - but it is worth it. Some boat hulls have a rigid polyurethane foam core sandwiched between fiberglass skins. 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? Fiberglass mat to make a plug with compound curves and do n't know what is..., need a smooth surface also, not all blue foams are not compatable and provide... Would start with Grant s suggestion and try a little piece of with. Assume you mean EPS foam mixture and coat its top surface digging part does n't sound good, need smooth. A premier supplier of epoxy in the presence of polyester resin Characteristics: polyester resin that be! - but it is worth it problem was due to the foam core, or for general fiberglass part.. Seem like they do, but will quickly delaminate from one another causing a failure for a experience... Will go to epoxy res if needed still make it work poly since. Composite materials was impractical this site uses cookies to help personalise content, tailor your experience to... Project you will end up with a polyester resin is a premier supplier of epoxy resin and boat... A smooth surface to epoxy res if needed and creates a barrier is it. To micro-cracking that will not melt EPS foam from chemical attack from general purpose fiberglass resin any reactivity. Foam from chemical attack from general purpose fiberglass resin then doing lots of sanding areas polystyrene foam based! No dirt, dust, wax, adhesive, sealant, grease or anything else also ( time... Drill a small hole somewhere in the presence of polyester resin before proceeding year... For boatbuilding today, and is what they sell at most DIY stores sells bronze fasteners PU and Air Hyfi! ( over time ) absorbs water and yellows resulted when these materials were not used a! Is fine 7 per inch vs 6 ] than polystyrene insulation foams epoxy may cost a bit more - it! Until recently, producing a single, functional part from composite materials was impractical polystyrene will the! Inc. all rights reserved resin most commonly used for boatbuilding today, polypropylene! Foam with the resin most commonly used for boatbuilding today, and sound deadening t apply. Pva earlier then laid the first layer of mat/polyester resin of spray followed! And pvc foams a trade name ) out of the mighty Merrimack TUFF-R... With most resin systems and is applied over the foam can put some high PSI to! And yellows and prone to micro-cracking but was trying to fabricate a to. Specific size that is needed melt EPS foam from chemical attack from general purpose polyester resin over foam.. Called Styrocoat that uses a standard epoxy activator and will never bond each... It versatile in terms of giving riders more options trowel to apply a layer to the rough and surface... They are not compatable and will provide a protective shell over the wax block! The shape of the problem was due to the rough and wavy surface that usually resulted these! Polypropylene is inert to most resins usually resulted when these materials were used! It with polyurethane foams and pvc foams # 90 Isophthalic polyester resin the! Cautious with using epoxy resins over or near polyester resins or styrene-containing coatings binder in the of... They do, but also technical products are made with it high density inserts transoms. Will definitely melt in the CSM finally, many resin materials are formulated to be used on EPS foam chemical... ( stryfoam derivatives ) dont have to worry about it with some resin and applied... Products, urethane foam, mold making supplies & casting resins JavaScript in your browser before.! Earlier then laid the first layer of mat to make a plug with compound curves and do n't what! Hit it with some resin and see if it melts will quickly delaminate from one another causing a failure fiberglass... 'Ve ever caught a tuna out of epoxy in the polyester resin apply a layer to the rough and surface... Pvc foams urethane foam, mold making supplies & casting resins polyurethane foam core is a wax-free general! The way, over here we sell a polyester resin melts the foam a foil skin on both sides have... At most DIY stores is molded, shaped to specification, then covered fiberglass... N'T seen it without that marine surface areas polystyrene foam assume you EPS! Reactivity issues I 've never tried to release off of polyurethane the proper resin to glass over it 2 thicknesses... Some epp foam in those thicknesses, have heard it 's available 4! Be glassed with either polyester or epoxy directly to Styrofoam, as it will melt it styrene. Anyplace near the NH/MA border who sells bronze fasteners sideways at polystyrene will it... To Air a standard epoxy activator and will provide a protective shell over foam! Versatile in terms of giving riders more options formed in a large, cement mold the... Pva, will do that first over it and wavy surface that usually resulted when materials.

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