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I make my tail from fiberglass and all I had ever done was two patches on a canoe. I had no idea what I was doing as I tried doing it while the daily high temps were 25F out. Polyester resin takes 8-12 hours at that temp to become non tacky and be able to re-coat or sand. I used Dow Blue board foam (I am from Midland MI, home town of Dow) and the polyester only ate about 1/8" into the foam and then stuck to it hard. Here the big box home centers carry 3m brand "epoxy" (polyester) resin for about $35 a gallon.
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