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I don't have any first hand experience to share. But, once upon at time I read somewhere, possibly (probably?) on this forum, about folks gluing pieces of coroplast together. The tip was flashing the surface with a flame torch to break down some kind of coating. Just enough for that, not warping the coro, so scrap practice seems prudent. Maybe it's a UV protective coating? Then it was gluable. I'm thinking chemical adhesion here. Mechanical adhesion by sanding only maybe at play with some paint flaking anecdotes.
Another thought: election signs. Find some place that does that kind of printing. Maybe they'll share a nugget or two of experience about making coroplast hold colors.
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