I'm not sure I understand the question but I like to keep the water on the outside of the radio box not absorb it on the inside. I use tape on the lid, speedmaster seals for pushrod an atenna tube, fill the tubes on flex cables with grease. Leak test it in the bathtub fix any leaks and leak test again. If it will stay dry submersed it the bathtub it will stay pretty dry running at the pond.
Mike