Hi, I've been masking some areas of a Panther in order to replicate the 'dazzle' winter whitewash pattern I've recently discovered. Like you, when I pulled the tape off I was left with those nastly little ridges of paint from the build-up of the 'whitewash' color. My hobby shop dealer recommended a Tri-Grit Premium Sanding stick to cure this. The sick itself-#30505- is an ultra fine grit stick with three grit patterns to it. By taking the finest two sections of grit, I have been able to remove these 'dams' of paint with no damage to the paints underneath. And thusly have really nice flat edges. Of course I have the occasionally 'run' under the tape, but have been able to just used a fine brush and touch this up as well. And once the paint is cured for a day or so, I agian used this very fine side of the stick to 'sand' the area down, once again, with no damage to the paints underneath, so far.
At least this particular method has worked for me on this project.
Good luck and take care, Sgirty