For some strange reason, I ran out of MAS hardener before the resin. Since I have very little left to do, and couldn't find Mas hardener locally, I bought a pint of West System 106. Tried it with Mas (2:1) and it cured okay.
Finally my question: the can states: "Not for clear coat." I am assuming they mean there's no UV protection, but I am not sure. Need an epoxy guy(or girl) to advise. I plan to sand/varnish after epoxy cures.