What specifically do you ask for at Staples for the CP overlay? What material? What did you use to affix it to the CP? Thanks!
Staples will print over sized full color prints or posters. They use a heavier than normal paper. You will have to work with them on the size, it's best if the file you give them is in PDF format, and is formatted to the EXACT size you need it printed. PDF.... you just need to rename the AI file to PDF.
I had them laminate the CP, just on the top side, then trim the laminate back to the edge of the paper. I used 3M Super 77 spray adhesive. You spray it on the control panel, and on the back of the overlay, be very careful when you apply the overlay, it doesn't peel back very well, basically once it touches the panel, it's stuck.
Good Luck!!