thanks for replying
so guess its lead sealant from the outside...last application perhaps 7 years ago though can't quite get my head round why not sealing the path of ingress would not work (I wondered about any ongoing issue as a result)
any tips?
out of interest; vague approx what might...
Hi - woodburner - stainless pipe through roof via lead flashing - has storm collar - ok for several years now (after some external sealing with grey lead sealant) though now leaking a bit in intense rain between the double wall pipe and the lead tube. (suspect through rain bouncing off roof...