I'm restoring a 69 B body, with full undercoat. I know the undercoating was applied after the gas tank, fuel lines brake lines, E-brake cables, body plugs, fender splash shields, rear shocks were installed.
I assume the undercoat was sprayed after the engine, trans, exhaust and rear end were lifted up as an assembly.
I've seen undercoat on the removable trans crossmember. Also the rear spring hangers have undercoat. How did they avoid getting undercoating on the exhaust pipes and mufflers? Were the seats installed first? I recall seeing taped off spots at the seat mounting holes on some cars.
Basically, what parts were not installed before undercoat was applied?