PowerHouse is good plug material...however...I found if the temp gets a couple degrees off the "suggested" then it takes 14-18 hours. I get air bubbles in the mix but always watched it, time to time and found the bubbles all came to the top and never gave me any problems.
Last winter the heater shut down, on one of the coldest nights, and it took over 24 hours to cure. I now use TechLine, never had problems, easy to mix, color takes well with less drops, IMO, just a better material.
I was told that if I didn't like it I could have a refund/exchange but after contacting them, I was told it must be a temp problem and Ebonite would not exchange or refund, so it is back to TechLine for me.
To be fair, I might have gotten a bad batch, who knows but I don't like it, either.
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az guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net