Well, after trying everything mentioned, including plasti-zap, poly-zap, epoxy, sanding, different cleaners,etc., I finally settled on E6000 glue. It is like a thinner version of shoe goo or goop. It is really a contact cement that is supposed to be put on both surfaces and allowed to flash off a couple of minutes, then the two pieces are stuck together. That is tough to do on the EZ plastic pieces which have to fit around curves and stuff. So I tried just putting the E6000 down and putting the piece into it wet. After curing overnight, the bond is EXCELLENT. I did no sanding, just a wipe down with rubbing alcohol. There is plenty of time to position the piece into place and cleanup is easy with rubbing alcohol. On a sample piece, I could pull the pieces apart only with a lot of effort. And the stuff stays a little flexible which is good. So far I have glued on the wing center plastic covers and reglued the little plastic cap on top of the vertical stab. Supposedly, E6000 is not UV resistant, but who cares - the model will only be in the sun short periods, and I can always reglue it if need be. And the E6000 is cheap and available at craft stores like Michaels, etc. By the way, this model is a Chipmunk. Gotta love the EZ's.