Some lessons learned with coroplast. This stuff prefers mechanical binding methods, as very few glues will stick to this "low surface energy" material. 3M Hi-Strength 90 is ok, but you will need at least 2 cans @ $13 each to make the wheel, possibly more. I also have a specialty cyanocrylate type adhesive, Tech Bond BP Blue. This stuff is expensive, but should be much less messy and cause less thickness buildup, as the 3M #90 goes on rather like wood panel glue or caulk. 

So a better choice might be a mechanical clip with barbs to insert in the ends. This can also serve to bind the pieces to the center hub and support ball bearings. Working on a design, trying to learn Open SCAD.