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Conformal coating is a thin coating that completely waterproofs electronics. And you can still access the stuff on the board if you need to. It's much better than any RTV. Give it a try.Is flex-seal easy to remove ? Never tried it.
I fill connectors and things with dielectric grease. Does not melt-and-run when hot. Still soft when cold.
https://www.acehardware.com/departm...cation/automotive-lubrication-greases/8167280
Never use ordinary RTV (silicone seal.) It gives off vinegar as it cures. Vinegar is 8% acetic acid. You can get "marine grade" RTV for electronics. I use it to seal up motorcycle ignition modules and voltage regulators that I had to cut open to repair.
There is stuff called "re-enterable encapsulant" somewhat translucent and you can remove it with a fork.