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Silicone sealant should be OK to cure your problem. It's best to use "non-acetic" silicone as the normal stuff produces acetic acid when it cures which can cause issues.
If the set has stopped sizzling then all should be good. Damp is certainly an issue, I've recently had a couple of sets runnning that were fine in summer but are now busy sizzling away due to the damp winter weather.
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