RE: CA Glue HZ SuperCub?
Glue - Read the manual, it is very clear on this point. No, the plane is not made of EPP it is made of ZFoam, which is quite different. Zfoam is more similar to Elapor, which Multiplex uses on their planes. Yes, you use CA on this foam.
As far as reinforcement of the wing, be sure to put the wing struts on. They are not just there for looks.
If you like you can run a stip of fiberglass tape down the center of the wing from root to the struts to help the wing handle the stress of aerobatics,but other than that, I don't think you need much else. Remember when you reinforce an area, that means that things break somewhere else. If you snap off a wing tip it is very easy to reattach it. If you over strengthen the wing, then you will simply break the plane somewhere else, somewhere that may not be as easy to fix.