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Well done, sime! It's very satisfying to get that first copy out isn't it?
I'm afraid all I can suggest is MORE waxing. I tried some PVA that a local GRP workshop gave me but it just beaded on the mould surface, so I had no confidence that it would form a protective layer. I've mentioned carnauba wax as the best type to use, and of course never a silicone wax. Take time to do this, leaving the last coat of wax for 24 hours to properly harden before applying another, and go for at least five coats. Try to go around the mould in a different way each time to avoid missed sections.
Repairing your mould: sand off the residual gel coat fragments, then smoth with up to 1200 grade and rewax. If there are holed in the mould surfacethen fill with Plasticine! Smooth with a wet finger and wax.
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