Lab Metal Ready-to-use metal repair and patching compound. Spreads like paste, hardens into metal. Lab Metal adheres to metal, wood, plastic, glass, fiberglass and more. Apply right from the can. Can be milled, drilled, tapped, ground and sanded smooth. Will not shrink or crack. Water resistant, rustproof. Withstands heat to 350°F (higher for one-time powder coating exposures).