ANTI-HEAT° HEAT SINK COMPOUND is great for protecting the bearings and boots of universal joints during welding! It protects metals and other materials from the heat of welding, brazing, or soldering. It absorbs surface heat to prevent buckling or warping in thin materials. Also prevents discoloration, blistering and cracking. It's fast and easy to apply directly from the caulking tube. Safe to use on any vertical, horizontal or overhead surface. Anti-Heat is non toxic, harmless to the skin, and odorless. Cleanup is easy - just wipe off the excess and wash with water.