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Cheers! I had some videos where it was smeared on the olive face, but that was fitting a new valve on an existing tail/olive. Planning to use the new tails that came with the new valves in the two rads I'm refurbing. So the new tail will be compression fit to the new valve with a new olive, avoiding mixing and matching (for no other reason than it sounds like the better thing to do in my head). The rad that's getting the TRV swap due to the leak, I'll leave that to the plumber's discretion.
stevo_com
Make sure everything is v clean.
Jointing compound helps everything to slip and tighten up evenly but I rarely use it on compression joints - only on BSP.