Quote:
Originally Posted by deuce_roadster
If you are new to this you may not know that ALL bare metal needs to be etched as step 1. Rust is iron oxide. Immediately after making shiny bare metal with a grinder or sander, the oxygen in the air will start the process. Metal etch is a substance that turns the iron oxide into Iron sulfate which is inert and stops the oxidation process. If you don't do this step, eventually you will get pimples from rust show up in your final coat that you worked so hard to achieve. You can buy this stuff at Home Depot (Metal prep and etch) for about $12/gallon or you can buy essentially the same chemicals at the Automotive paint store for $40-60/gal. Since it is an acid read and follow ALL directions.
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I would assume that "Ospho" is the same type of product? Once I weld in new patch panels and or fill small holes, I will treat with Ospho for 24 hours or less, then clean with surface prep, then re-prime until ready to start blocking the whole body!!