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I wouldn't use polyester resin. I would use thickened epoxy instead. Polyester resin isn't as waterproof as epoxy resin is, and its ability to bond to old resin is much weaker than that of epoxy, so it is very unlikely to give you as good a waterproof fix as epoxy would. Polyester resin is also significantly weaker in tensile strength than is epoxy resin, so not as suitable IMHO for repair work.
Also, I would recommend drilling the holes out a little, since it is very likely that the person who drilled them filled them with some sort of sealant compound, like 3m 4200 or such...and the resin (epoxy or polyester) really needs a clean, dry, firm surface to attach to.
I think both of these steps are far more important on a cored-deck than on a plain fiberglass deck, but would do it for either.
Finally, if you're set on using polyester resin, you'll probably want to wipe down the screw holes with styrene, to try and "re-activate" the existing resin and give the new polyester resin a chance to adhere better. However, styrene is fairly toxic... so you really need to wear gloves and a VOC respirator while using it.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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