Bubbling things on a coach usually mean bad news. I found a ton of this kind of stuff when I was shopping for a used coach. The first thing I looked for was bubbling. Both inside and outside on the shell. Usually this means rotten wood is behind whatever is bubbling. I’m pretty handy at fixing almost anything (except electrical) and even I would not want to mess with this stuff. First off, rotted wood means water intrusion. Just that alone is difficult to deal with. Although, finding a leak is the hard part. Then there’s the repairs. The area where it leaked and anywhere in the path of the water. Now we won’t even talk about mold... I would find something else. This one will cause you heartache. You will spend time repairing when you should be camping.
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