Just bought a 1960 house with unfinished portion of a basement that has had previous water intrusion and the crack has been injected. There are a few lingering cracks I want to deal with. Wall has weird stucco/popcorn type of concrete coating, swirled on about 1/16 inch thick. I want to put liquid rubber primer and a sealant on this entire wall. Can I just primer it then seal it with a liquid rubber product as it is or should I get to bare concrete? Thanks!
That is a skim coat and depending on how well it was applied it can be difficult to remove. I use a needle scaler (welders use these to relieve stress and quickly clean slag from rust) I got my first one from harbor freight years ago and literarily war it out doing similar work. It is not hard but time consuming. I don’t know if there is an electric version but it was recommended by a friend that is a millwright. needle scaler. I googled needle scaler and there are quite a few on line the last one I purchased from HF has probable been used over 100 hours, the one before that lasted 10+ years they really make the job easy. I have no connection to HF except having purchased a few of there tools some are real junk but I have a few that have been recommended by friends that have lasted well beyond my expectations.