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Old 02-04-2009, 11:25 AM
  #25  
cherikeered
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Default RE: FIberglass Mold How to Tutorial

Resin will eat almost all foams. The only foam that is resistant is polypropylene, or "EPP". But it is only RESISTANT, it will still become distorted sometimes. I work in the special FX industry making tons of molds, etc. Don't use floral foam, go to home depot/lowes and buy a 4x8 sheet of bluefoam or pinkfoam housing insulation, it is much more dense and holds excellent detail and is much cheaper. Fiberglass resin will eat it too but there is a cheap solution, Elmers wood glue, or any wood glue for that matter. Just brush it on or thin it and spray it on, at least a couple coats, works great. Make sure that there are no holes, even a pinhole will let some resin seep in and eat the foam. All you need is a layer to separate the resin from the foam. I have even seen a guy in a pinch use BUTTER! It worked pretty good actually.