Need some help from a rust guru!
Never grind paint off of a body. Grinders are used for welds and scratching metal for body work adhesion. I always paint remove the paint and blast the rust with crushed glass or glass beads.
Sand will warp the metal. Sand blast at night and watch the heat. You will see why you shouldn't. Grinding is even worse. If you paint remove the paint you will acually see what you have. Even a DA orbital sander heats the metal and hides previous work.
These grinder marks were under the original paint on this Duster below. We would have never seen this work done at the factory if we used a DA/orbital sander. The last coat of paint remover use a fine steel wool. If we would push this car out overnight only the grinder marks would rust. The unsanded sheet metal will not.
I have a Demon setting in a race trailer here since 2002 that many members have seen. The outer skin is just like this Duster and still no rust I primered only the weld and grinder marks. Every once in a while I would wipe it down with metal conditioner
Never grind paint off of a body. Grinders are used for welds and scratching metal for body work adhesion. I always paint remove the paint and blast the rust with crushed glass or glass beads.
Sand will warp the metal. Sand blast at night and watch the heat. You will see why you shouldn't. Grinding is even worse. If you paint remove the paint you will acually see what you have. Even a DA orbital sander heats the metal and hides previous work.
These grinder marks were under the original paint on this Duster below. We would have never seen this work done at the factory if we used a DA/orbital sander. The last coat of paint remover use a fine steel wool. If we would push this car out overnight only the grinder marks would rust. The unsanded sheet metal will not.
I have a Demon setting in a race trailer here since 2002 that many members have seen. The outer skin is just like this Duster and still no rust I primered only the weld and grinder marks. Every once in a while I would wipe it down with metal conditioner