Update:
I am still getting water in the tail light. I removed it again and put some more water in it to find exactly where it is leaking. It wasn't the seal, it has a large, but hard to see crack about 6" long across the middle. I put some tape over it, but obviously this thing needs to be replaced. So the lesson here is if you have this problem, do a test to see where the water is coming in from first.
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