Rust under the roof strip at my 100s

Moin I have to the roof afford my soda on both sides rust under the strip. I had already read myself cleverly because of the dismantling, but what I could not read out is whether I also need the rubbers new in the 100’s when I take out the triangle window in the back, or whether it is only the case with the A6? and how would you best go there to the rust? my plan was to grind everything down first, rust converter up, and clear varnish on it, until my paintmaker has time to get on the matter.