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Cheers for all the info. The moisture 'weep' appears to have stopped - it'd be nice to know whether this is gonna prove to be a weakness in the future, but I'm not complaining right now! I finally managed to hunt down the central heating (gravity hot water, pumped heating) drainage point -...

Ok - it would appear that the moisture is appearing on the nut that is closest to (virtually touches) the radiator (the nut that tightens the valve tail into the radiator's bottom?), not the nut the tightens the radiator to the copper pipe (well, the lockshield/wheelhead valve). I'm starting to...

Thanks for the suggestion. So, I guess that I would close both the valves (to stop the flow), put a container underneath the tail to catch the spillage, loosen the nut, remove the old PTFE tape, wrap fresh PTFE tape around the thread, then apply some of this joint compound, then re-tighten...

A few weeks back I removed a radiator in order to decorate. Last night I refitted the radiator and placed kitchen towel under each end of the radiator to highlight any leaks. Overnight, there haven't been any drips BUT one of the radiator valve tails is slightly moist. This is strange because I...