Last summer, I painted my concrete block basement walls with a waterproofing paint. I started by brushing them with a wire brush to remove ant dirt and loose pieces, washed them with a muriatic acid solution, let them fry for a few days and painted 2 coats with a day in between. This past spring, with the melting snow and rain, there were a few spots where the paint just popped off. Over the summer a few more areas popped loose. Not very big areas, most are half dollar sized areas. I am thinking to start by again bushing the areas for loose pieces, washing it again with the muriatic acids, and repainting, hoping for the best.
Any thoughts or experiences for me?