After noticing water collecting in one of my headlight units, I removed it
and pressurized it using some of the hot air God gave me and I observed air
passing through the left and right seams between the lens and housing. The
top and bottom seams were noticably better glued than the left and right
seams, if the left and right seams were even glued at all.
Is running a bead of all-weather sealant around seam between the lens and
the housing a good idea?