FOSTER SEALFAS G-P-M Mastic is a high solids water-base general purpose mastic having excellent trowel and spray properties. G-P-M is used for the protection of thermal insulation and hard, dry cement coats, both indoors and outdoors. SEALFAS G-P-M Mastic is fire-resistive and features ease of application, non-flammability, non-toxicity, mild odor, range of colors, insulation compatibility, good package stability, plus excellent outdoor durability.