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Thread: Foam to use as a base in fiberglassing, bondo work, etc.

  1. #1
    Constant Bitrate
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    Foam to use as a base in fiberglassing, bondo work, etc.

    Hi guys, so I'm just about ready to get my project underway (molding the lcd into the dash) along with various other things that require fiberglassing, bondo, etc. and I've read that 2-part expanding construction or 2-part expanding packing foam can be used as a base for applying resin/fiberglass over. I was wondering if as an alternative to these foams if I could just use plain old styrofoam. My guess is, the resin will eat right through it, but has anyone actually ever tried this? Can you tell me for certain that it won't work and that the styrofoam will melt? If it is possible to use styrofoam this would be ideal as it is dirt cheap, easy to shave/shape, can be bought in about any shape imaginable, and if I wanted to get real creative, like molding a face into something, I could just buy a styrofoam dummy head and fiberglass it in. Just wondering about this, thanks for the knowledge.

    -DK

    EDIT: Okay so I've woken up to reality and realized that of course the resin will melt the styrofoam... much like gasoline will.. my question now is, can you recommend anything that will sufficiently protect the styrofoam from the resin but will maintain it's shape? Like some sort of spray on coating that would dry evenly but not be too thick?
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  2. #2
    Newbie
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    good ol aluminum foil should work if u cover up da strofoam good neva tryed it tho

  3. #3
    Maximum Bitrate srcstc's Avatar
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    Some 2 part foams can handle the resin just fine. Check www.shopmaninc.com. The have good prices and can answer your questions if you call them.

  4. #4
    Constant Bitrate aleromaster's Avatar
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    Floral foam. That works great
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  5. #5
    Constant Bitrate
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    Hmmmm.. yeah I've heard that floral foam works too... interesting. Thanks for the tips guys.
    2002 Subaru WRX - Silver
    -FP18G turbo
    -Walbro fuel pump
    -Modified OEM 840 CC Injectors
    -TurboXS: UTEC, turboback, uppipe, intake
    -Blitz FMIC
    -STI cluster
    -17"x7.5" SSR Competitions
    -Tein Flex coilovers
    -NOS 50 shot
    -2004 rear conversion

  6. #6
    Constant Bitrate JaxPt's Avatar
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    yep floral foam and then cover it with foil, tape, combo of both, just something to keep the resin from eating the foam
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  7. #7
    Maximum Bitrate
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    ive used standard styrofoam and the resin didnt eat it at all.

    I coated a styrofoam ball purchased at a hobby shop with fiberglass. no problems.

  8. #8
    Constant Bitrate
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    Quote Originally Posted by WhiteRabbit
    ive used standard styrofoam and the resin didnt eat it at all.

    I coated a styrofoam ball purchased at a hobby shop with fiberglass. no problems.
    woah, are you serious? can you tell me what exactly what kind of resin you used? Did you use the cheap styrofoam from like stereo packaging?
    2002 Subaru WRX - Silver
    -FP18G turbo
    -Walbro fuel pump
    -Modified OEM 840 CC Injectors
    -TurboXS: UTEC, turboback, uppipe, intake
    -Blitz FMIC
    -STI cluster
    -17"x7.5" SSR Competitions
    -Tein Flex coilovers
    -NOS 50 shot
    -2004 rear conversion

  9. #9
    Constant Bitrate
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    yess please tell me more interested in this floral foam too - was it easy to use ??

  10. #10
    Maximum Bitrate
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    no, not like polystyrene expanding balls

    I have a feeling it wont eat those, but I have no experience with those, i really dont know. my gut says no.

    I was using standard polyester resin, and the styrofoam you find at hobby shops in blocks. or balls, as in my case. or cylinders....or heart shapes.... you know, that hobby styrofoam. the kind that looks like polyurethane 2 part expanding foam, rather than like a billion little balls expanded into a mold to form a shape of something.

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