I am starting to think about the finish for my cob oven that I covered over in perlcrete. We've used it a few times and its down the typical thing; out the front it's sending burn marks up and the flue is got a lot of soot and general scorch marks around it too. I've seen a lot of pictures of dome ovens with that happening. I wondered if there was something I can do about it in the finish, or if I'll have to just embrace it and make it part of the architecture somehow.
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Preventing scorch marks or making them cleanable