[Toadies]

A good quality postal package tape (clear) will also do the trick. Do use it on the outside of the cage. You could also run a small bead of bathroom caulk along the cut on the inside, after you have the coroplast in place. If you don't make it a large, thick bead the piggies won't be able to get to it. There are low odor varieties of caulk for wet places available but you still need to let it air out awhile.