Purchased Evercoat Formula 27 filler. This stuff was a pita for me. Hard to mix so you had a decent amount of working time. Mix small batches. Easy to sand. I have sprayed the gelcoat. Best gun I found was the HF 20 oz gun w/ 1.4 nozzle. Blew thru 2 guns before I got it right. Small gun with dryer sucked. Mixed 3 ozs of gelcoat with 3 ozs of Duragloss, 6 drops of brown & 12 drops of hardener. Had good working time. I got the color very close. Pics of the boat after 220 grit sanding in the next post. I'll be cutting down the air pressure & adding the HF disposable moisture filters on the next spray. With 2 in line filters, I still got water. Articles I read says to place horizontal & vertical 1/2 inch pipe pipe after the ac with a drain to cool air remove water. I though I taped off well, but I found gelcoat over spray where it shouldn't have been.
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