any ideas? why did they put it all over? have been under the car for at least 20 hours this summer with various wirewheels on dffrent style grinders, i have tried to soften it up with starting fluild, brake cleener, paint stipper, and follow it up by more grinding when its softer. i was hoping to get the underside in etchlock primer and chassis black before the cold rolls back in. anyone know a better way. im about 60% done.