What are you planning to use for the undercoating? I did quite a bit of rust repair on my 1983 300TD and I am ready for undercoating now. I played around with some cheap rustoleum undercoating in a can and it worked pretty well but it would not build up nearly as thick as the stock undercoating so it is very noticeable where the patches are located (especially on the rocker panels). I feel like the only way to build up the undercoating to match the stock undercoating as closely as possible would be to get some sort of brush on under coating, does any one have any insight in this or have any suggestions?

Thanks

Von