Waterproof Battery

Did any of you protect the lipo cells with silicone or Epoxy? I protected my last battery with Plasti Dip, but the following was recommended to me:

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Nerver used but looks suited to the job up to 48V. Transparent, adds 1.2 kg per litre of resin poured in the battery case.

I asked already they said till 20S no problem.