I would recommend Merton fiberglass. Very competitive pricing, very fast shipping and stocks just about anything needed to build or repair a boat. Carries high quality resins,cloths,gelcoats,paints, fasteners, foams, etc.
Disclaimer is that he is a friend of mine but he is a great guy to deal with. Like me, most of his customers end up becoming friends with him. He's .A pleasure to deal with and he won't try to sell you something you don't need.
I Met him 35 years ago when I was restoring an old wooden boat. He's the guy who told me that I needed a Seacraft. I've been thanking him ever since for that.
His Web site is
www.mertons.com