I'm designing a monitoring system for plants based on a lithium-ion battery and an ESP8266 (Adafruit Huzzah board). Due to the application, water may come in contact with the battery and/or electronics.
I'm considering a potting of the whole system except the usb connector for recharge purpose. The curing is producing heat than cannot create problems with the electronics/battery.
I found polyurethane based product : Electrolube UR5634RP250G (Farnell : 2476085). Do you advice this kind of solution ?
If you have cheaper solution, that could be nice too ;)
What about the thermal dissipation ? Are those kind of product corrosive for electronics ?