When I was building used cars we used 3M 'schut', I've prolly mis spelled it but give it a look .

Available in brush on or spray, it takes a special large nozzle spray gun to shoot on .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better