Always spray this primer on both sides of any panel to be spot welded. It will prevent any future rusting between the panels. It's about 98% zinc in a special epoxy resin which adheres very well to all metals. Material sprays out to a medium grey and is heat resistant up to 914 degrees Fahrenheit. Some concours enthusiasts use it on mufflers and heat exchangers without a change in color and no burn-off. Can contains 13.53 fluid ounces.

Note: This is a zinc concentrated material and it must be constantly shaken for consistent spray out.