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  • I've used Wiska boxes for some applications and they have a gland that breathes. It's about £10 per gland though. I would aim for totally waterproof. There is an electricians putty which can be useful for sealing but it's apparently condensation caused by temp changes that can create moisture inside sealed boxes.

  • I've seen a gel used to fill junction boxes outside but I'm not sure what the thermal properties are like with something that generates heat like a plug back PSU?

  • I had thought the same thing but wouldn't recommend 'potting' the transformer with that gel. There are other materials you can use to 'pot' a transformer though. I don't have the experience to recommend one though.

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