The material is made up of three 1/16" plywood plies with the gelcoat layer over that, total thickness is only about 1/4". I wonder if the panel has a plywood ply seam at that point. The company that sells the material to Winnebago only warranties the material for 10 years, otherwise I think you might have a claim. If it were my RV I would buy a roll of Clear Gorilla Tape and run a continuous strip over it, to make totally sure no water can get under the gelcoat layer and start to swell and or de-laminate the plywood layers.
The tape will be almost invisible if you cut off the ends you touched with your fingers so that there are no fingerprints on the adhesive side. Be sure to push down the edges as best you can. The only extra work is keeping the edges of the tape clean, and to replace the tape every few years.
Randy - Manhattan, Kansas
2015 Vista 27N
2016 Honda HR-V