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you're supposed to cut ~1/8" above the surface to avoid edge chipping, and if you run it through the ts with the masking still on, I've heard it's a good idea to lube the blade with soap or wax to prevent the masking adhesion from sticking to the blade.
supposedly, you can use blades designed for aluminum and copper. If you have one of those, maybe try it on a test piece. But here's one from Freud for exactly what you're doing: