I had to seal my porch light as it was filling with water when the cover drain hole got plugged with goop. The water filled the fixture to the wires and the water wicked down the wires to where they loop under the fridge. That water filled the drawer under the fridge with an inch of water and soaked the carpet on the floor in front of the fridge. I removed the porch light, no sealant, no gasket but a 3/4Ē hole the wires pass thru and the light just screwed to the side of the coach. I remounted the light and ran a bead of clear silicone around the top of the light. No more leaks after 2+ yrs.
USN - RETIRED NUKE