me too!
I had the same conditions in a 1986 Seidelmann 295 that I am refurbishing. Although it was a lot of work, I removed the lining in total throughout the entire boat, down to the fiberglass, including the side liner. It was so worth the effort, and left me with "a blank canvas" to work with. I have looked at over 30 boats to compare the various types of coverings used by manufacturers, and it basically comes down to a matter of personal taste. Being in the northeast, I am opting for something with an R value, rather than a sheet extrusion product. Unfortunately, the fatal flaw in Seidelmann boats is the foam backing on an otherwise quality liner. With time, the foam breaks down to a powder, the adhesive which held the liner up by means of adhering to the foam becomes useless as the foam separates from the liner itself. The effort required to do it right is well worth it, and regardless of what you replace the liner with, the finished product makes the boat "look like new". One final tip, leave the fiberglass bare long enough for a good rain soaking of the boat, locate and identify the source of any leaks, and deal with them before you install the replacement liner material.This will insure that the underside of whatever you do use remains high and dry, and the lifetime of the liner will be significantly longer.Good luck, and keep us posted!Sully