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.
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