Bondo cures and becomes solid whereas putty will remain soft. Bondo
putty refers to the putty like mix before it cures. I'd use it for
rotted areas which are cleaned to good wood. I've used epoxy but it is
more expensive than the polyester, Bondo. To extend epoxy in wood, I
sometimes blend with saw dust.
While it's still plastic,it's easier to shave down,cuts down on dusty
try RAKA epoxy(a thin,boat-building epoxy);
they have kits that are not as expensive as West or System Three,and they
aren't the polyester resins either.
There are all sorts of fillers you can use with thin epoxy;
Wood flour,plastic microballoons,plastic fibers,chopped glass fibers,and
fumed silica.I mostly use wood flour and fumed silica.
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