The stuff I've used in the past is 'Premium paint Mask', I think I got my last lot from Cherwell Sign supplies. You can get it from loads of different places. I'd contact a few and ask for a sample. THe one I use is transparent grey, a very light black grey. My mates use one which is more of a brown grey, doesn't hold on the backing as good so they struggle to cut small stuff. I've done some real tiny lettering on mine before !
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