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deriving a mold from a polystyrene foam pattern2/29
how can i take mold from polystyrene foam. it melts easily. i coated with paint it didnt work. i coated with sand, it worked but the mould was rough for rough purposes. i need a smooth as bottle type of mould
please i need someone that has experienced this before to comment
A friend of mine builds custom cars and motorcycles. He prefers the pink foam for his work. He puts on two thick coats of green dishwashing liquid, then a layer of aluminum foil. The foam holds up long enough for the resin to set.
Styrene is the solvent in polyester resin. It attacks the polystyrene foam. Acetone literally melts it.
You can use epoxy resin over polystyrene and they are compatible. We use the blue/pink builders foam rather than the white rough stuff.
If you want to make hollow fibreglass/carbon objects the easiest way is to shape a piece of poly foam. Epoxy glass it. Drill a hole in it. Pour acetone in and it will dissolve the foam instantly. Then pour the acetone/foam solution out.
Try coating with yellow glue? Somewhere I read that it will work but haven't tried it.