Conformal Coating is the best method to waterproof your flight controller, Esc’s vtx and more. With a small hobby brush simply apply as if painting on to easily waterproof your gear. Motors generally do not need waterproofing so you should not conformal coat motors but all other electronics can and should be to protect from moisture, fog, rain and submersion. Avoid conformal coating inside usb connector ports and other areas where you might insert a sd card or a usb connection. 5ml’s easily enough to conformal coat the electronics of a standard FVP build. Ths is a silicone based product that dries quickly and provides a plastic like coating over electrical components that can easily be re soldiered over if needed.