A gray mastic for hand application designed to seal irregular openings between materials such as metal, masonry and wood in entrances into foundations and structures. Seals against the entrance of water, dust and insects. Also aids in vibration dampening. Nonhardening, nonshrinking, noncorrosive or staining, nontoxic. Temperature range of 20 deg. to 200 deg. F. Application temperature range 60 deg. to 90 deg. F. 1 lb. package.