Had basically replastered the walls and ceiling in the guest bedroom. How to make sure all the dust was off the surfaces before priming??? I love using tack rags but didn't want to do this all by hand -- bingo. I got out my Swiffer Sweeper and instead of the dust cloth, I opened up a fresh tack rag to the correct size and attached to the Swiffer Sweeper. Went over all surfaces, turned the tack rag over and repeated. Just applied the primer and there is not a single spec in the paint! Thought I'd share the tip;