: What do you guys think?

It's really your call. System Three is good epoxy and since you are already familiar it, you could get just enough (from Sys3) to finish this boat with alittle left over for some tests. Then order samples (usually about $10 each) from a few other manufacturers and see which one it is you like best for your next boat. There are lots of epoxies out there, and each has it's own chemical properties. Until one of them comes out with a fully UV protected epoxy, it's all personal preference. I currently have Raka's thin resin with slow(350) and fast(610) hardener, US Composite's thin resin and slow hardener, and System Three with a medium hardener (I think). As for wetting out glass, I like them in that order.
Scott