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I've never glued coroplast, but I have glued polyethylene. I find that heating the surface with a heat gun just to the point where the surface starts to become glossy helps the glue to adhere better. I read in an engineering textbook that this polarizes the surface in the proper way to improve adhesion. It can be kind of tricky, though, making sure you don't melt the plastic.
That may be one reason why Saand above has success with hot glues.
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