How to Block Paint From Seeping Under Painter's Tape

Place tape over the surface where desired. Extend the tape slightly longer than the area needed to ensure that it fully blocks the area where the paint is needed.

Draw the tip of a putty knife over the tape and apply even pressure to bond the tape to the surface.

Shake a small can of clear glaze vigorously for approximately two minutes. Open the can using a paint can opener or flat head screwdriver.

Dip a 1-inch paint brush into the glaze and drag the brush against the edge of the can opening to let excess drip back into the can.

Spread the glaze over the top edge of the seam. Draw the brush so that it covers some of the tape and some of the outer wall for the most successful coverage and bond. Leave the glaze to dry on the tape and wall for approximately one hour or until it is dry to the touch.

Paint the wall with a paint roller or paint brush. Cover the wall up to and including no more than half of the tape, but do not go over. Let the paint dry for 2 hours.

Use the tip of a razor blade or utility knife to pry up the tip of the tape and slowly peel it off the wall. Lift the paint straight off the wall and not at an angle to avoid pulling at the paint covering.