4. Here are a couple of masking tips that will help produce a clean finished design. Instead of taking the time to carry the design through the entire door jam, stop the design about a 1/2-inch in with a small piece of tape. For the area between the cab and bed, it's a good idea to push the tape and paper deep into the void. In some cases trucks can flex while driving into the booth enough to tear tape and paper if you just go across the gap.