A couple of weeks ago, I noticed that the joint between the companionway and the salon cabin ceiling is separating. This is the U-shaped joint just under the companionway sliding hatch cover. I need to re-bond the joint, probably all the way around. Any suggestions about how to approach this project? I assume that I'll have to sand/grind away gelcoat finish on the under-surface, grind a fillet at the separated joint, support the ceiling liner with a brace, fill the fillet with some sort of epoxy-fiber, then maybe add two layers of fiberglass tape all around? Is this structural failure a sign of other problems?Thanks!