I know most Hackaday builders have already worked their way through these issues, but we keep getting calls from researchers new to the game. So I produced a nice summary for them of the waterproofing techniques we’ve used over the years. Hopefully there’s one or two ideas in this post that folks here find useful.  Cheers!
https://thecavepearlproject.org/2023/03/17/waterproofing-your-electronics-project/