I don't like how soft bondo is... you can stick your fingernail in it... so
I mix fiberglass resin (about 20%) with bondo.
Sticks better, harder, harder to sand, much thinner than bondo
alone so you may have to let it set up in the pot for a couple a minutes...
using it on surfaces that are not close to horizontal is difficult.
Sometimes it is bondo... sand... bondo-resin mix... sand... resin... sand...
spot putty.
Works for me. Remember that the filler is hydroscopic, so just filling a
1/8 inch
rust hole with it will blister the paint unless the hole is sealed first
(resin & cloth
on the back side of the panel if possible... or dimple and apply on
outside).
--tomsa
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