First, if you can wait at least 24 hours (2 days is better) for the wall paint to dry, ScotchBlue Painter's Tape for Delicate Surfaces can be used to mask off the wall. Other tools like painting edgers work well when painting the wall near trim, but not so well when actually painting the trim.
How long should paint dry before removing tape?
Remove the tape while the paint is still wet by slowly and carefully pulling away from the paint line at a 45-degree angle. If a bit of paint seeps through, wipe it away immediately with a damp cloth. If the tape is left on until the paint dries, removing it can result in peeling.
How long before you can put masking tape on fresh paint?
"Freshly painted" means any surface that has been painted within 30 days. You must wait 24 hours before applying tape to a freshly painted surface and then choose a tape designed specifically for this application, such as ScotchBlue™ Painter's Tape for Delicate Surfaces.