Body-schutz is a very thick sprayable coating often used by pro body shops to fill scratches and small grinder marks in a panel without actually doing metal work. It's a 2-part that requires thorough mixing. Think "spray-able bondo". On our Pantera when I first bought it, it had a big 'run' on the hood paint, that returned twice after sanding it smooth & priming; turned out to be some uncured body-schutz from a poor mix some 3 yrs before I bought the car. Going to bare metal was necessary to get rid of it.