ShelleyAnn,
Mine cracked too and I replaced it last season. I think those plates are only around $10-15 and if I remember they come with a new gasket. Just make sure if you replace it, get one compatible with your skimmer. Also you may need someone to help support the outside of the skimmer and DO NOT overtighten the screws (that's what cracked mine).
I would think silicone would work too, but changing the plate is a relatively easy task.
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