Hi from a gmc newbie, but veteran of camper gutting.

[Billygoat]

I used this stuff. Worked great on both walls and ceiling. Got it at Menards but don't know if it is still available.

http://www.gmcmhphotos.com/photos/g4446-new-ceilings-or-headliner.html

Ah perfect Larry, will check this out. Big Menards goer, “save more money at Menards”! So its pliable enough to make the curve in the wall I take it?

 

[Keith V]

I used that for my walls, got it at Home depot.
It's a little soft, a screw will dent it.
Some had concern about fire, and the plastic melting / burning. but I covered it with vinyl and foam, so I'm screwed no matter what.
But the headliner adhesive stuck to it well
And Yes it took the curve well

 

[LarryW]

If your coach is pretty much stripped, when putting the ceiling in, I cut the panels wider than my initial measurements. Like about 2"" wider. There is a bump in the sidewall where the wall meets the ceiling, With the panels cut a little big, you can bow the pieces down and by setting the edges of the ceiling panels against the bumps, you can "pop" it into place. If it doesn't pop, cut the width of it 1/4" and try pop again. Keep cutting a little at a time off until it pops tight against the coach ceiling held in place by the bumps. If done right, it is tight in place and unless you roll the coach, it will never come down. Before I put it up, I glued Marine "Hull Liner" to the panels with contact cement. https://www.dltcorporation.com/category_s/343.htm. This stuff is made from recycled plastic water bottles so is sound absorbing and does not stain. Any stains can be wiped clean easily. To put the cabinets back up, I took pictures of the ceiling ribs and measurements as to where they are. Then used a ice pick to positively locate the ribs. Holes don't show thru the Hulliner. Then screwed the cabinets to the ribs with self tapping screws. Looks nice, practical, and the panels have a R3 insulating value.
Been there for 15yrs now with no issues. JWID