This coach was bought used and the major issue was a large bubble behind the rear window. 

When the skin is delaminated like this, it means water had gotten in. 

The water had compromised all the luan wood used in the wall assembly. 

We removed the bad wood and smoothed the rest. 

We also had the rusted framing to deal with. 

It was pretty rough looking. 

Rust. 

So we removed as much rust as we could and smoothed out the insualtion. 

The next step was to coat the steel. 

We used a rust converter coating to take care of the rust that we were unable to remove. 

Looking better. 

New luan Installed. 

Everything put back together. 

Because we didn't replace the fiberglass, there is still a wave because the fiberglass was warped. 

But it's dry, solid and our cutomer saved the money on the paint part of this job.