My 2009 B5 R/T Classic started showing the bubbling paint/rust signs ahead of the rear wheelwell a few years ago and a quick internet search at the time informed me this was a 'thing' with these cars and it's gotten bad enough now where I just want to get it fixed. The bubbling paint is probably about a 5x7 patch from the exterior, but who knows once you get into it. Since it's such a common problem with these cars, is anyone aware of a quarter panel patch that might be available? In terms of treatment- it seems most of it involves removing as much of the foam from the inner fender as possbible. Any other tips? Does the foam have to come out or can you soak it in Thompsons water seal or something to keep the water out? If the foam was retaining water, is there any way to route the water out or add drainage holes in the inner fender?