Everywhere I look at this chimney project there are more questions.
Where the fireplace opening meets the chimney above there is a lot of old tar burnt onto the concrete and brick.
I would like to stabilise the whole thing, to stop little bits of mortar falling off, and preferably paint the whole thing as well.
The first problem is the tar - can I clean it off? Can I paint over it without the paint just peeling off?
Cheers
Dave R
You can chip/wire cup brush in angle grinder most of it off. If you then give the surface several coats of PVA & water is will seal the surface & then paint/render. (Render will need to be mixed with PVA and water.)This will stop the tar bleeding through paint etc and get good adhesion.
If it is a rendered surface with tar on, probably best to chip all off right back to brick/concrete work &so tatally get rid of it
It will need sand blasting
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