Hello all, I just have a w109 BJ 72 standing completely naked on a roll frame. Threshold/backplate and spare wheel chuck are newly welded. The car comes from California and has a neat layer of extra fillers and varnish that have to get down. Color is to be 180G – silvergraymetallic. Current offers are at almost 10k€ incl. control what is already a bad house number…but also go on for many hours. Therefore I want to prepare as much as possible I want to do a lot of preparation work myself. First of all, a fundamental question about the underbody and the weld sealing. Everything looks pretty good here. The aim is to paint this one out of true to the original in the vehicle paint, but without metallic effect. My building feeling says with UBS down the seal and rebuild everything in order not to experience any surprises…! What m Some painters would only paint over it because the original rust protection is probably the best. For the escape of almost 2,000€ in the room with dry ice blasts due to the large surfaces. My consideration was to work the surfaces with an exenter sander and only to radiate corners and co….can you recommend here a good grinder in the grit…? Possible with suction because of the grinding dust..? What do I do with the cavities in the longitudinal beams…? Can i ch that somehow also treat and protect..?