I have been using RAKA (
www.raka.com) epoxy and glass. Larry is a great guy to deal with.
He offers Fast, Medium and Slow hardener.
If the temps are above 70 degrees forget about the fast hardener.
You can get everything you need from him - Biax(glass), fillers, etc. etc.
I started with one of his 6 gallon kits on my project thinking it would get me somewhere - at last count I am up to about 15 gallons.