How have I never heard of this? A neat, straight paint line at the top of a wall is tough to achieve next to a bumpy ceiling. So before you paint, drag a narrow flat-head screwdriver lightly along the ceiling. You'll get a clean paint line and no one will ever notice that the bumps are missing.
Dreading that paint job you have to get done? Don't put it off any longer. Here's a list of Family Handyman's best, mess-free painting tips that will get the job done faster, smarter AND without all the mess!