I am in the process of spraying my walls with Behr waterproofing. underneath the watermarks is green (what I think used to be the color of the painted masonry) but when I chip away at the cinder blocks it's all dark black and very brittle.What am I looking at here? House was built in 1947, so the cinder blocks / masonry are a good 70 years old.https://ift.tt/2Jkhi69 via /r/DIY https://ift.tt/2Jk5TmJ
