Hi Nancy, welcome to the Village. I do not use painters tape because it becomes tedious removing the small bits of tape between fret holes. Instead, I glue the pattern to the wood, then apply a single layer of clear packing tape. The tape lubricates the blade to help eliminate burning and the blade last longer. It's simple to remove the pattern and tape by heating the pattern with a heat gun or hair dryer, or spritzing some odorless mineral spirits onto the pattern, let it sit for a few seconds, and the patter and tape will lift right off.
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