Re: How much epoxy should I buy.
I previously said 10 gals but used 13 gals of epoxy on a recent 17' project. It was beefed up with extra glass everywhere plus all the sealing, gap filling and gluing. I think it was 20 yds of 30"w x 18oz woven roven and 10 yds of 48"w x 1.5oz mat. Poly projects take less resin because you don't gap fill or glue with it.