On 2007-01-28 09:42:02 +0000, Siggy said:


I am now of Andy's view that it must be a weeping rad valve or someat
similar. Hence my current choice for introducing a leak sealer
chemical, just to eliminate that area of possibility.

I would go round and do a physical check on all the radiator valves.
If there are any leaking, you can try packing the gland and tightening
the nut.

Leak sealer is more geared for leaks around joints and so on. I am
dubious that it would reliably fix a radiator valve leak.