You might want to try Handibond's new Plastic CA. The guys in Hawaii are using it exclusively to build with coro. The nice thing is it works without having to flash or do any of the harder preps, just make sure the gluing surface is clean (I've had some coro that was cut for shipping that came out of the shipping box with some sort of contaminant, probably oil from the cutting process). I just wipe down the surface with mineral spirits and paper towels. I've seen test sample pieces that were butt glued at 90 degrees and the coro failed before the glue joint!