PVC backdrops

[nickelplate759]

I trying to figure out how I want to do the backdrop for the new layout.  I plan to paint it to look like a hazy, featureless sky.

For my past two layouts I used a faux-Masonite (some knock-off brand) backdrop.  It looked OK, but was hard to work with and keeping the seams from cracking is a challenge and I'm looking for a different (hopefully better) solution.

Several folks have suggested vinyl flashing. @Ed Kapuscinski suggested this one:
https://www.lowes.com/pd/Union-Corrugating-14-in-x-30-ft-Vinyl-Roll-Flashing/3299110.
It's 14" x 30'.  That would mean one seam (I'd need about 36' to have no seams).  Not ideal, but better then Masonite (5 seams) and way easier to apply.

So a few questions:
1. how would one treat the seam so it isn't visible.
2. how would one paint this?  Does it need a special primer, or just interior latex?

[Doc Frankenfield]

pvc and vinyl are tough to paint, I would recommend light sanding and then. use Fusion spray for a base coat.. it will bond.
 as far as the seam.. the only thing that comes to mind is PVC glue.  laminate a second section to bridge the joint behind the display surface.

[davefoxx]

Try some Dupli-Color “Adhesion Promoter,” a clear automotive primer for plastic and vinyl.  I sprayed some on a cheap plastic pickup truck before painting it with a rattle can of basic white.  Unfortunately, the clear coat was a bad batch, so I attempted to strip it with 91% IPA.  The clear coat came right off, but the white paint would not!  That Adhesion Promoter works!

DFF

[Plate C]

Sherwin Williams Extreme Bond Primer works well on PVC. It also doesn't hurt to lightly scuff the surface before applying.