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Old 08-11-2006, 08:36 PM
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foam for fiberglass mold

I read a post several months ago about using foam as a mold for fiberglass. What type of foam do I need to look for at the craft store? Need to carve up a mold for a center console.

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Old 08-11-2006, 08:46 PM
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Urethane foam.
Do not use styrofoam, it will dissolve under the resin.
later, mikey
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Old 08-14-2006, 08:26 PM
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Will spray foam insulation work if I form it into a workable block? All the craft store carries is small blocks, I would need 25 blocks for the size I need to make.
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Old 08-14-2006, 08:40 PM
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Quote:
Originally Posted by stea
Will spray foam insulation work if I form it into a workable block? All the craft store carries is small blocks, I would need 25 blocks for the size I need to make.
Check commercial roof contractors. They use plenty of foam blocks.

Vince
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Old 08-14-2006, 09:16 PM
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Spray foam will work, but it is harder to sand because it will have to be built up in layers and that will cause soft and hard places. Foam of different densities is very frustrating to shape. I tried it one time on a big industrial plug we were making. . You are better off building a wooden box to take up some space then covering that with pre made foam sheet.

If roofing foam doesn't work out for you,
There are mail order houses that sell the stuff by the 4'x8' sheet. If you can't find one contact fiberglass hawaii, in santa cruz CA. They ship all over.
Hope this helps. mikey
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Old 08-14-2006, 09:33 PM
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Urethane foam is very easy to work with. All shapes and sizes can be purchased from Aircraft Spruce and Specialty, or Wicks Aircraft supply. Gross shaping can be done with a knife, and final shaping can be done with scraps of the same foam, a wire brush, sandpaper, Disston Abrader, etc. If you are planning on turning out multiple pieces, line your mold with duct tape or saran wrap so the finished piece doesn't adhere to the foam. Wear a dust mask when cutting and shaping the foam.

http://www.wicksaircraft.com/catalog...382/index.html

http://www.aircraftspruce.com/catalo...ethanefoam.php
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Old 08-14-2006, 10:27 PM
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I didnt even thick of the foam used on flat roofs I'll check with the local roofing supplier. THANKS GUYS
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Old 08-17-2006, 05:25 PM
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I go to lowes and get 2" blue foam for foundations i believe.. its 2X8 and shapes very well.. i use super 77 spray adhesive to glue it together and make any size i need. as long as u use epoxy resin it will not melt the foam.. polyester will though.
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