Gelcoat repair issues

[cdlong]

I have started gelcoat repairs on SeaCracker and am having issues. i started by opening the cracks with a church key, but that wasn't working out. I went to a dremel with various shaped stones and am taking the cracks & nicks down to fiberglass. I'm using Evercoat Marine match & patch. My issues are: pin holes in the gelcoat after sanding with 220 grit. I assume I'll have to add anothe layer and repeat the sanding process? I have several areas where I'l sanded thru to the fiberglass upon sandind with the 220 grit? I'm not so much worried about the color as I know a really good match will come with continued repairs. 1st batch was a little to reddish, second batch was closer. My sandpaper ranges from 80 to 800 grit & I'm using rubbing compound & Mother's carnauba wax. I tried several marine waxes, but Mother's has the best shine.