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Do a quick search for 'gelcoat alligatoring' and read about what it is and what causes it. You're on the right track with may not have waited long enough between coats, but there are potentially other causes too. Very common issue with styrene based gelcoats.
At least it looks like an easy enough spot to repair. Clean it well, then sand the low spots with 80 grit and clean again. Then fill with the same gelcoat you used to make the mould, but you will either need to add wax-in-styrene or cover the repair with flash tape or release film while it cures so that it fully cures. Then sand it flat and polish.
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