I ran a bead of black silicone gasket maker around the perimeter of the housing. Second off to ensure a good seal, but not too generous as to get messy. I reset the lenses, and clamped them to dry for 24 hours. Now is a good time to note that the factory set up is not waterproof. There are gaps at the wire to bulb connections that are open to the atmosphere, so there is no need to worry about getting the housings sealed air tight.