I do low voltage work for a living and anything in this condition should be blocked by fire. I usually buy it at Lowes or Home Depot, but it was a few bucks cheaper at the Prime Store. My problem is that for lack of a better word I would describe it as watery. It hardened, but it took much longer than usual. I had a few spots where it just dripped back out of the hole. Normally a good product but I'm not familiar with Revain.