Wasn't it called Zebart or something like that? When I lived in Houston for the summer of 83 I worked for this company off Katy Freeway that did the LP gas conversions for fleet vehicles and was contracted to work out of Port Arthur to rust proof and undercoat a fleet of trucks, vans and whatever those road vehicles that can run on rail tracks like the trains. That was a nasty job. There was 5 of us fighting over who would be the one to climb under those vehicles to spray that heavy black stuff. One guy did them all, IIRC about 100 vehicles had to be done. One person removed the lights and other items, one drilled holes and put the plugs in afterwards, one sprayed the gunk in the holes, hood, trunk lid, rockers and anywhere you can't see, I did that, and it was all put back together. Took about a week and it was messy an tough to get out of your hair.