what kind of bond do i need

hey I was about to buy some bond when I noticed there was like 20 different kinds. Theres some that say stuff like gold filler and fiberglass reinforced so how do I know which one I need for making a lead mold will one kind hold up better than the other.

Get this, Bondo Lightweight Body Filler pint 261, a perfect amount for a cobia jig mold. If you plan on making more or are worried about messing up, get a quart.