Clean a concrete floor before painting by removing dust, oil, grease, old coatings, and weak surface residue; then profile smooth concrete, rinse thoroughly, dry fully, and verify moisture before applying paint. The correct method is to clean, decontaminate, profile, dry, and test the concrete before painting. Surface cleaning removes dirt, grease, and loose material. Surface profiling improves the mechanical bond where the slab is dense or smooth. Moisture...