Thanks, this is a papered chimney breast, have stripped off the old emulsioned paper, the wall is still a bit damp and I wondered if I needed something a bit more penetrating to seal it ?
It was originally capped with a vent top but this was changed for a anti-crow cage when we started using it again. The cage top was not too waterproof in the winter with no fire on ! Have since reverted to ceramic vent top. The soot stains came when accumulated soot (now cleared) was water soaked.
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