Here is one more way - what I actually did when I cracked one side of a PVC cage:
I went to a sign shop and asked for "Sintra" closed cell PVC - they knew what I was talking about - same material used in PVC cages. I bought a small piece of scrap they had. About 6mm (roughly 1/4 inch) thick.
At home, use a straight-edge and a utility knife and score the piece to a size that will cover the crack at least an inch on each side, or more if you want. Keep scoring the PVC until you can more easily bend it to snap it, or just use a saw, whatever works for you. Sand it to get smooth edges. Shape it how you want. You can get creative and make a 1/4 moon, a lightening bolt, whatever you want. Epescially if using a jig saw to cut the piece.
Get some regular PVC cement - the kind used for PVC plumbing - glue the patch on (inside the cage or outside, whichever you want). Just hold it down for about 2 minutes, it will grab.
This will give you a super strong repair. And since it is the same PVC material, it expands and shrinks with the cage material.
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