3M Scotchkote Poly-Tech 665 20LtrScotchkote 656 Poly tech BP Primer (Thortex Poly Tech BP) is a single pack coating that has been specially manufactured as a primer and sealer, for use on asphalt, felt and porous mineral roof surfaces. Uses Scotchkote 656 Poly tech BP Primer is best used in conjunction with Scotchkote EC 661 Poly Tech Finisher. It offers excellent weathering resistance and resistance to UV light, when applied as part of a roofing protection system. Surface and
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