It’s really a lightbox, so almost any decent quality paper that is thin enough to let light through should give you good results. (just good quality, ordinary white copy paper run through a color printer). See how it goes and what you come up with.
I Hope this helps you. Have fun!
We’d like to see everyone’s custom billboard signs! I’m working on the next set of billboards and I could use some help! Please post photos below.
Thank you, Mark the Menards Train Guy