delamination

I would venture to guess that with a 19 year old coach the repairs might cost more than it is worth. It's a very labor intensive job. Maybe not to the extent of an aircraft radome (repaired shipboard radomes in a past USN life) but still at $100+ an hour labor rate the work can get very costly. The other problem is what ever the size of the delamination that you can see or feel, double it. Usually there's more damage then can be seen. Best option is to find what is causing the damage and fix that to stop further delamination and live with what you have as long as the coach is still safe to use.