>Is there a reasonably simple way to tell the difference between
>polyester and epoxy?
If you're talking about looking at a fiberglass fender or boat or widget
that was manufactured, it almost certainly was polyester. That is what is
pretty well universally used in production. It's cheap.
But if you want to be sure, sand it a bit. Polyester resin has a sharp sort
of acrid scent. Even years after manufacturing it'll still have the scent.
Epoxy has comparatively no scent. What you will smell will be a much softer
scent. Mmm, vaguely like scorched sugar.
If you're trying to figure out of a repair kit is epoxy or polyester, the
polyester kits are cheaper, and usually have the resin in a paint can that
you scoop it out of. Epoxy kits cost 3-5 times as much, and the resin is in
a can that you pour it out of, like pancake syrup. Polyester kits will
dance, trying to impress you with their epoxy like qualities. Epoxy kits
will say they are epoxy very clearly, and don't ever want to be confused
with polyester.
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