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Thread: Foam

  1. #1
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    Foam

    Hey, I read that someone ( from this board ) started his project from carving the panel out of insulation foam, I tried the same sprayed a bunch of insulation foam ( from can ) to a open box made out of cardboard. The result isnt really what I expected. On the container it reads that It only takes 1h to cure and mine still didnt settle ( except for the outside which is hard ) so I cant carve in it... What insulation foam should I get?

    Tom

  2. #2
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    Quote Originally Posted by bmwperson
    Hey, I read that someone ( from this board ) started his project from carving the panel out of insulation foam, I tried the same sprayed a bunch of insulation foam ( from can ) to a open box made out of cardboard. The result isnt really what I expected. On the container it reads that It only takes 1h to cure and mine still didnt settle ( except for the outside which is hard ) so I cant carve in it... What insulation foam should I get?

    Tom
    NVM I guess It takes a while for it to settle... luckly I got nice new server from hp and they had some foam that I used Can I put fiberglass directly on the foam?

    Tom

  3. #3
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    The foam he used was probably pree-expanded. try useing some of that foam they use in florests for putting flourers into.

  4. #4
    Maximum Bitrate brrman's Avatar
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    Only certain types of foam can withstand putting fiberglass on it.
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  5. #5
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    Quote Originally Posted by brrman
    Only certain types of foam can withstand putting fiberglass on it.

    Yep there was a thread where it was actually tested. The peanuts disolved pretty fast from what I remember.

  6. #6
    Maximum Bitrate jzgt's Avatar
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    Foundation foam

    You'll probably want to use the type of insulation for house foundations. It's generally bright pink or light blue. It can be found in the local Home Depot or Lowe's. It's rigid, dense and can be carved with an electric carving knife (yes, the kind you use on Thanksgiving ) and sanded with a DA. I've done some pretty thick stuff by attaching a few pieces together with great results.

    - Jeff

  7. #7
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    you want urethane foam. resin melts syrofoam.

  8. #8
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    The type of foam in a can is polyurethane. When you fill a large container with this foam it could take several days to cure. I'm not sure if the resin will attack this foam, but I have a feeling that it won't. This foam can be difficult to shape. Your other choices are Expanded Polystyrene, this is the white foam that coffee cups are made from, and Extruded Polystyrene, this the pink sometimes blue foam you see in builder supply stores. Expanded Poly is probably the better choice because it is easier to obtain in blocks than extruded poly. Both types of polystyrene will be attacked by most resins. Expanded poly is used by many fiberglass fabricators. The key is before you apply resin, paint the foam with latex paint, to really shape it you can apply body filler over the latex to smooth everything out, but that is not neccesary unless you want to make a mold.

  9. #9
    Variable Bitrate Curly_cat's Avatar
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    Isn't the stuff that was used for that screen mounting the hole filler foam that expands and cures once you have sprayed it??

    I've used it for gap filling and it sets within a couple of hours.

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