Permatex - Valve Grinding Compound - 1.5 oz. Tube - 80036. Aids valve grinding and seating operations to remove burrs, surface defects, carbon, gum and corrosion. Can be used for lapping and grinding chromium.. Mixes with water to form an easy-to-use paste.. Size - 1.5 oz. tube. Directions:. Apply liberal coating of Permatex Valve Grinding Compound to valve. Grind in usual manner. Clean valve and seat with damp cloth. Wipe thoroughly with dry cloth. To thin compound, add a few drops of water.