Coax-Seal is a hand-moldable, plastic mastic suitable for sealing a wide variety of materials, metals, plastics, vinyls to accomplish a strong and waterproof, long-lasting seal for coaxial cable fittings, CATV, marine electronics, antennas, feed lines and microwave work. A black, tacky, mastic material which is non-conductive, non-toxic, non-contaminating.