Gary if the crack is separated, then you would want to try to bring it together with some sort of clamping. And, CA may not be the optimal for that (or it might - depends). If it is a crack that has come back together but you want the two pieces permanently mated, then CA will bleed into the crack better than any other glue and it will form a perfectly permanent and waterproof bond.

Pics help. Good ones anyway.

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BrentD, (Professor - just for Stan)
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[Linked Image from i.imgur.com]