WOW i have never seen gelcoat deteriorate that bad.. I would sand back into the good gelcoat and reapply new gelcoat in several layers you can get a gal. of white gelcoat for $60.00 from Fiberglassite.com I have never sprayed it before but i think if you just brush it on in several layers you will be ok ,,,just make sure you dont add wax to the gelcoat till the last coat
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