Yes. I wiped every thing down with Alcohol, used Q-tips for every edge, corner. If you miss a spot, it will peel. When I did a sample section, I used Vinegar and the paint peeled. Tried Alcohol, since I can't use any chemicals such as TSP, and it worked great. The trick is to be patient. Let your first "scratch" coat dry 24 hours if your paint is a 3 in 1. No need to primer.