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bassboy77

making my own molds out of bondo?

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My question is can you use Bondo or fiberglass to make a lead mold?? I use Durhams Water putty to make a Lead mold but it takes a full 2 days for it to dry to use (two parts to the mold 1 day per part). Anyone made a lead mold out of bondo or fiberglass and lived to tell about it?? I can make the mold no problemo I just curious if it can handle HOT lead.

Triton Mike

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The bondo (body filler) can handle the heat. But you have to let it cool down before pouring into it. The fiberglass resin will run a higher chance of cracking the mold, but if made thick enough it will handle it too.

Have the cavitys wider appart if pouring lead. As not to fracture the wall between the cavitys.

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