I'd like to second what Pedaler has stated, i.e. not to use vinyl. The catch word here is "polyester". It's looks and performs like vinyl but without the toxic/corrosive fumes.
Another product that serves the purpose is a liquid mask material. You brush it on with a paint brush allow it to dry and then laser through the coating. At that point you can paint fill using brush on, spray on or whatever technique you prefer. The mask has a "rubbery" consistency so it's very easy to peel off after the paint dries.
Coincidentally, our September issue is in the mail and it contains a feature article on color filling which covers the whole gamut, including the liquid mask technique.
Also coincidentally, the issue contains an article by Roy Brewer (Pedaler) titled ironically, "How to Get Rid of a Salesman." This doesn't have anything to do with laser masks, but since David recently proclaimed Pedaler as a "guru" in another thread, I thought this tidbit might be of interest.
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