When I was looking for a newer truck camper I came across tons of campers that I liked except for the fact that about 90% had delamination problems. One of the campers was exactly what we wanted but had front delam around the over hang window. I went to the local RV repair shop and started asking about how you fix and since it was a small area around the window, what would it cost to have them repair it. The guy in charge of the repair area said, if it has delamination, we charge $2000.00 just to start and then its hourly after that.
He said they would fix it but its expensive and if any water get in its gonna just delaminate again, he suggested to me, if its not horrible live with it and just use the camper and enjoy it....
That was my experience with delamination and I passed.
You tube has some vids on repairing delamination thats where I would check first if i was determined to try to fix it.
Keeping all the seams and around windows sealed is really important to keep delamination at bay
