Flexseal
I wish I could remember the name so could give credit where it's do. There's another fix for this out there using Flexseal. I did what he did and have pulled my taillights quite a few times to check. That and a homemade gasket works like a charm.
If you're good, and patient, you can make a really good gasket out of rubber tubing. Just split it down the middle and wrap it around the lens edge. Leave a weep hole in the bottom for condensation. You shouldn't have to touch it again until you lose another bulb.
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