Vapor-Barrier Paints Rated To the Editor: Your December issue is terrific. Both the selection of topics and the information provided are excellent. The asbestos piece ["A Contractor's Guide to Asbestos"] should be required reading for every contractor. Congratulations. I'd like to respond to an answer given by Henry Spies to a question about vapor "barrier" paints. An article from the April '84 New Shelter deals with just this question. The article refers to a more complete technical report available from their product-testing department. New Shelter claims to have surveyed about 90 percent of the paints on the market at the time to come up with six brands that met their qualifications as vapor "barriers." Four brands are primer-sealers [Moore's Alkyd Primer Sealer, Sears Best Oil