[Shop-talk] Patching fiberglass

[Nolan]

Epoxy, not polyester resin.  Polyester resin is the cheap, stinky, goey
stuff car folk work with.  Terrible stuff.  Epoxy doesn't stink, isn't
cheap, is a liquid, and is wonderful to work with.

You'll find epoxy sold in boating stores.  I tend to use West System myself.
http://www.westsystem.com/ss/  You use that and some cab-o-sil thickener and
you'll fix those holes up just fine.

As for the cracks, grind to a bevel, fill with the cab-o-sil thickened
mixture, and you'll likely have a good enough repair with no backing or
cloth buildup.  Don't use mat, use cloth, it's stronger.