Crack In Skimmer

[duraleigh]

Without draining below the crack to make a dry fix, I would say you'll have limited success. You just can't get a good underwater bond.

Drained below the crack, two-part epoxy glue would be my first choice. Still has to be done carefully to get a lasting repair.

[Poconos]

I did a major patch on mine a few years ago. Accidentally punched a major crack through the bottom just inside the opening. Had to drain a little so the area was dry. Used a mixture of ground up PVC pipe and PVC solvent. Applied the thick paste over the crack. Been holding fine since. Ground a piece of pipe with a rasp file. Can also use a coarse saw or anything to make small chips. Success depends on whether PVC solvent attacks the skimmer material. Try a little solvent with a Q-tip on a surface to see if it attacks the material. If it does, go for it.
Al

[waste]

While I'm sure that doing it dry, as per Dave and Al, will help to insure that the leak seals, I've had very good success using underwater 2- part epoxy. I think Al's method will do a better job than either Dave's or mine, but as he says - it will depend on whether the solvent will sufficiently soften the skimmer plastic.

Good luck with the repair, if you have any ?s about the 2- part epoxy, just holler

edit- see https://poolforum.com/pf2/showthread.php?p=48692