There is cement that bonds pvc together. PVC cement is something you can get at a hardware store and will permanently bond those cracks back together. You will need to unscrew the board from the enclosure if possible and then use the cement to seal the cracks together. It dries fast but you might want to give it a day to make sure it doesn't off gas.
What you want is Oatey heavy duty pvc cement. Basically you are doing the same thing you do with pvc pipes.
Silicone will not permanently bond to PVC and will just come off.
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