The car had a lot of surface rust, but we will focus on one area here on the door. As you can see, the stripping process didn't get all of the rust from the surface. The rust eats little craters on the metal that are below the surface so paper won't get in there. This is why media blasting works so well, but The Fast Etch will also do the trick, and the parts don't leave our shop. The gallon jug was enough to treat our entire car.