Originally Posted by jeffstevens763@g
I would say block them up in a dry warm room if they do mist the heat from the bulb will clear it when in use
LED's? Heat? Wouldn't count on that process being very fast.
Getting moisture inside a nav light is not as bad as on electronic devices with a screen you have to read. The light gets spread out anyway, so no real effect there. It may eventually cause some corrosion issues, but in sea air, you're going to get that either way. If the moisture causes electrical problems due to shorting, they weren't sealed up well enough to last anyway.
That said, I'd plug the holes; a dab of silicone sealant should do the trick.