I found this cool tip when browsing Facebook yesterday. Anyone tried this trick?
If you have trouble with paint creeping under masking tape, here is a simple fix. After applying your masking tape, spray the edge of the tape with the color already on the model.This will seal the edge, and any paint that creeps under the tape is the paint that is already there. After the base color dries, spray over the joint with the new color. Remove the tape as soon as the new color is dry to the touch- don’t wait for it to cure. This will give you SHARP edges without touch ups!