S50 METAL PATCH/FILL 3.5OZ. | Repairs broken, rusted or corroded metal. builds up worn surfaces, fixes gutter, grates, fencing, duct work, tanks, aluminum boats. Waterproof and resistant to oil, gasoline and most chemicals. Product is a flammable viscous paste with aromatic solvent odor, can be drilled, sanded or painted when fully cured.