I'm sure it'll be fine. Here's an FYI on Curil products:
http://www.bus-boys.com/bbzvc.htm
IMO, Curil T is intended for flanged joints or mating surfaces. I've used it on o-rings (specifically the oil return tubes) and the stuff makes a freaking mess of the tubes.
For o-rings, i'd suggest the old standby. The ubiquitous (I had to look that word up
) Dow Corning 111, 112 lubricant/sealant. The 112 is the higher temp stuff. Readily available from most any local industrial supply house. Or you can easily get it online at McMaster-Carr.
www.mcmaster.com