I'm doing some suspension work on the truck and nothing is working well on the undercoating removal. There is nothing on or in the truck to identify what the brand is but it's the best I've seen. No rust anywhere on the frame. The stuff has a texture like a pebble dashed stucco. Something was embedded in to the surface of the undercoating which I've never seen before but maybe someone here has and has dealt with this stuff. Sand blasting is a waste of time. A grinder works but it will take a minimum of 20 hours for what has to be removed. A torch gets it hot but does nothing to break through the surface. I've tried kerosene and fuel oil soaked rags wrapped around the frame with minor success but this will take more time than the grinder. If anyone has any thoughts or suggestions I'd appreciate hearing them. If it's any help the truck originally came out of the Philadelphia area.