There are kits available on Amazon. https://www.amazon.ca/s?k=marine+gel+coat+repair+kit&hvadid=605691920375&hvdev=c&hvlocphy=9000713&hvnetw=g&hvqmt=e&hvrand=10689386958024597951&hvtargid=kwd-303486044868&hydadcr=1969_13519908&tag=googcana-20&ref=pd_sl_4bcg4ebfle_e

The key will be to find the matching color but assuming the hull is white any white gel coat purchased should do the trick pretty well.

hope this helps,