I use Stag Wellseal; developed by Rolls Royce. It also doesn't go off.
It used to be called KMC Wellseal - I still have some - but it's the same stuff.
Relatively reasonable at £14 a tube.
It used to be called KMC Wellseal - I still have some - but it's the same stuff.
Relatively reasonable at £14 a tube.