Ever wonder how professional painters get those perfectly straight lines between walls, ceilings, and trim—without tape? It’s not just a steady hand or years of experience. The secret lies in a few simple techniques.

The first rule of touch-up paint storage? Keep it inside—either in a basement or an upstairs storage closet. If you’re storing it in the basement, make sure it’s up off the concrete floor, ideally on a shelf a few inches off the ground. Avoid the garage! In cold climates, paint can…