I would go with something other than plywood, ask Thor about his plywood experience!
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sorry about the old thread, but I searched to find this one. My sign I'm making for a bar is A/C plywood.. supposedly sanded and grade A on one side - it's rougher than heck! I painted it well, two coats primer, sanded, cleaned, painted two coats semigloss acrylic exterior, and let cure.. (in 60 degree shop) ..Applied graphics and was working on mounting lettering (It's going to be raised off the sign), and noticed the edges peeling on the vinyl!!
I am just short of scrapping it all and re-doing it.. I'm going to try to weight it down tonight to see if it helps.. Otherwise, I peel everything off and re start.
damn.
and never use wood again!