You dont use elmers glue, you use clear silicon sealer. Go to the autoparts store and tell the guy what you're doing.
That's the screw, it's near impossible to find the leak. which is why you have to re-seal it. You pop it in the oven at somewhere between 175-200 degrees, pull the headlight apart, clean out the old sealer with a knife, and put on the new sealer that you bought, put the headlight back together, and hope it worked. OOOORRRRR you could look into a better seal between the headlight housing and the actual headlight bulb. that hole you put the bulb through is a great place for moisture to sneak into, you may wanna try improving the seal around that before baking and resealing your headlight.
my guess is the lil rubber boot that goes around the bulb and is supposed to keep water out of the lens isnt enough, might wanna try your stock headlight boot on there instead, or make something.