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Thread: Glassing Foam

  1. #1
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    Glassing Foam

    Hi guys,
    I have been planning to build a custom electric car based on a production car's platform.
    I am trying to find a solution to glass the foam plug. I got the sample of the foam I planned to use, it is similar to the pink foam some guys here use to build plugs, but the one that I can easily buy locally is pale blue. I poured a bit of the resin mixture I will use to apply on it and the fiberglass, but the foam seems to be reacting. Can anyone of you tell me what I can do to avoid this sort of reaction?
    I have posted the link of the pic I took after it started reacting.
    https://ibb.co/gOCrbH

  2. #2
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    will few layers of filler putty be enough?

  3. #3
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    Apply multiple coats of shellac then light coat of filler putty
    https://en.wikipedia.org/wiki/Shellac


  4. #4
    Senior Member RCR's Avatar
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    I've tried Shellac before and had it fail miserably. I believe there are specialty coatings out there, but I've heard that latex/latex paint works.

    Bob
    Bob custom '84 Fiero SE --->>> custom F408
    http://www.madmechanics.com/forum/cu...ilepic37_1.gif

  5. #5
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    Clear, plastic packaging tape will work, or so I have been told by someone I personally know who I also know is very experienced at this.

    The latex paint will work, but the coverage must be very good with no imperfections and you need to make sure it is fully cured.

    Regardless of what method you use, try it out on a small piece first. Let us know your results.

  6. #6
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    Packing tape works just fine (first hand experience), but it's difficult to wrap a piece of foam with compound curves and not leave tape marks in the resin once it's all said and done.

  7. #7
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    allright! thank you guys, I will see what I can do

  8. #8
    Senior Member ArashB's Avatar
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    Ive been researching this recently....

    I dont know if this product is expensive.
    Polyurethane resin.
    https://www.youtube.com/watch?v=MDwQg6CX25A

    Another is wood glue, (Water Puddy)a kind of plaster, and cheese cloth.
    https://i.imgur.com/2bTuU1Y.jpg

    Plasti Dip might work.

    Mortar and Lowes Latex.
    https://i.imgur.com/J255SJD.jpg

    I would like to experiment with the latex stuff from Lowes and Waterpuddy in the future.

    With other chemicals, make sure you dont mix something that becomes hazardous like how one can suffocate mixing bleach and Ammonia bathroom cleaners.
    Follow my designs on Facebook fan pages. http://www.facebook.com/AutoArts

  9. #9
    You can use an epoxy resin rather than a polyester and don't have to do any prep to the foam. Aero Marine makes some nice products. I used some on my Snark sailboat a few years back.

    https://www.aeromarineproducts.com

  10. #10
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    I have used 2 coats of leftover latex wall paint over foam to prevent the resin from melting it. But I was using the glass over foam as the buck... not as a mold. Tried duct tape as it nicely contours over curves but ir wrinkled with the resin over top of it

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