Prime styrene areas on backdrop?

Model Railroader Layouts and layout building
1

My backdrop is nearly done! I have it secured and primed. I did it using masonite (1/8in thick) on the straight parts and styrene for the curves. I then primed the layout to cover areas patched w/ the plastic cement. Should I also prime the white stryene sheets?

TIA!

Lee

2

I would. I’ve had problems getting water based craft paint to stick to styrene.

3

Wondering what you might use/recomend for a primer?

4

I would use either cheap cans of grey spray primer or that Killz primer paint you use for walls.