Yeah, it's easy enough but a fussy job.
Clean it out thoroughly. If it's gone through to the fibreglass then use a dremel or similar to grind it out and make a fibreglass repair with wet resin and chopped fibres. Leave enough of a groove to apply gel.
If by some unfortunate thing it's cracked all the way through then you need to drill a 3mm hole at each end of the crack to stop it "walking", then repair as above.
If only cosmetic you can do a gelcoat repair straight away. Kits available online or at a decent chandler.
MAIN THING TO REMEMBER. Gelcoat does not air-dry. It must be covered in clingfilm or similar to make it cure. You would do well to read up on this bit, it's a PITA if it goes wrong.
Once cured you can then sand it flat with 1200 wet & dry, then final polish with a rotary buffer or similar.
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