I've got a few teensies soldered together and a lot of sensors attached to them. How long can I expect this to last before things start breaking down if I did a good job soldering and the device isn't exposed to temperatures outside of 50-80 degrees but is pretty humid (San Francisco Bay Area weather) ?

Would spraying the non-moving parts with this sealant help without changing baseline capacitance values in my proximity sensors (assuming I don't spray the sensors but do spray where their wires are soldered to the board)?