Heya, Bill...I use West 207 hardener combined with East resin (East resin is way cheaper) with good results. I prefer using the 207 hardener because I get a more flexible result on the hull. This allows the hull to flex over stuff I cause the kayak to run over without creating micro-cracks in the epoxy. So far I have used this combo for 8 years to good effect. Thought I'd toss this info out there. Oh yeah, the West 207 ratio on the can is 3.3:1.