The original stuff on the walls of my PP was a kind of dark brown shag carpeting. Yuck! I stripped it all off and used a power washer to blast off the old gunk and glue.
I found 3M Super 90 works great to glue reflectix to the cleaned fiberglass. Because I can get a bit anal about these kind of things, I used a peel-n-stick "aluminum" tape (HVAC guys use this stuff) to seal the seams.
Note: if you plan to run any 12V wires to lighting
, do this before you apply the reflectix. I use the same aluminum tape to hold wires flat to the walls.
Once everything is covered with the reflectix, I start laying out my new wall fabric pieces. Because of the PP's curves, I found it best to use a fabric that has some stretch to it, and is as pattern-neutral as possible.
For my TWCampster re-do, I found a upholstery fabric on sale at a local fabric store. It has a tweed-like texture and very neutral color and pattern.
With this material I found it best to use contact cementórolling the glue onto the reflectix and cloth assured a very good bond.
Lastly, to cover edges, joints and seams, I created my own trim using strips of the fabric. With first, the help of a hot iron, then a dab of cement, I folded the sides of the strips over about 1/2 inch, giving me a "clean" edge for my trim. This then got glued into position as needed.