Check out the original post in this thread for the pictures. The rust blistered the paint just behind the right rear wheel well and it appears to run back along the break which the bumper cover mounts beneath. I am cutting the rust out of that section and replacing that sheet metal using my donor car.

That section will need to be primed with epoxy. I also may get to metal in the rain gutters. While it appears there is some type caulk in those I suspect the paint is thicker and thus the cracking.

I'd like to put the epoxy primer on it as level as possible for as I understand this stuff doesn't sand so easily.

I noticed that reducer is used on certain products and thinner for others. So far I don't recall using a reducer. Perhaps with the Interlux two part clear. It's been a while and I don't remember.

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84 300SD
85 380SE
83 528e
95 318ic