Permatex® Valve grinding compound is an odorless grey paste containing selected abrasive grits dispersed in a waterbase, non-corrosive binder composed of gelling agents, lubricants, preservatives and ethylene glycol. It is a multi-purpose compound designed to aid valve grinding operations on automotive, industrial and marine engines. Can be used for lapping and grinding chromium-cobalt, hard-faced seats and discs. Removes burrs, surface defects, gums, carbon deposits and corrosion. Mixes with water to form easy-to-use paste. Combines special grits of various sizes that become finer as the compound is worked.