Ebonite is a good plug. I prefer TechLine HD. The temp is not so touchy. There's a few nights the heater didn't kick on as it should and the Ebonite is temp sensitive, took longer than I thought to harden. Never had a problem with the TechLine HD. Couple years ago the pilot blew out ( high winds) and it got under 55 degrees. The TechLine set as timed, worked great and no problems. It is a bit more I think than Ebonite but temp and shelf life is less important and longer shelf life, from what I've experienced.
Colors ( TechLine) mix well with both, forgot to mention.
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az guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net