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Oh, his help worked. I just wish I asked before trying to fix it myself. The peeling off of the vinyl twice was just too much for the foam and glue holding the foam to the board.I do not do upholstery work. I did a vinyl top 30 years ago and a can of 3M 90 will last 5 years in the shop for collision repair. I was in a shop when all the G body headliners fell in the 80's and avoided them.
I redid my single cab headliner a few years ago. I did what I thought was right and it ended up being almost exactly the method sewlow wrote a few pages ago. I used PPG DX300 wax and grease remover with a plastic putty spreader to scrape off all the old foam. I bought a thicker material on Amazon and did not use foam. I used contact cement from a quart can. I sprayed it with the 3M Accuspray gun system with the pressure cup, Incredible pattern adjustability and no cleaning, I threw the $5 head away. using multiple light coats as sewlow posted. So far the truck sits outside winter and summer and the liner is perfect.
Follow what sewlow recommends, it will work.