That would be what we used to call a hard roller. Purges air bubbles, helps wet out the fabmat and believe me you don't want to be sticking cloth or roving to old glass however abraided and cleaned without at least a mat layer underneath. The thing that strikes me about many questions about
fiberglass repair is that structural and cosmetic repairs are not differentiated. If you have a foot long tear or gash in a
fiberglass object you can't bridge and reconstruct with body filler. For the type of repair in the photo where the area effected is small and there's no real penetration, bondo is perfectly adequate imo. As for spraying, or Heaven protect us!, brushing on gelcoat, I say Good Luck, mate. Yes, you can fill a small scratch with gelcoat and take it down to the surrounding and, maybe, just maybe it will be good enuf but try building gelcoat on an already fair (where you want the gelcoat as a topcoat is not depressed from the level of the surrounding area) surface and then try feathering that into the surrounding without thinning or cutting thru to the point of transparency which reveals? Blue body filler, red body filler, green/blue glass. Yes there are guys that specialize in this sort of cosmetic miracle. A man needs to know his limits. Why I like rattlecan
paint which often is a better match colorcastwise than new gelcoat.
jack
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