[Bmw1966mk]

I got a 2019 430i, the rear right side tail light keeps getting condensation, I removed it last year to see what the problem could be but it’s a completely sealed unit so no gaskets that can be looked at. I dried it out last year, since I could see nothing that could be a problem I installed it again. Over the winter I noticed it’s doing it again, I removed the light yesterday and dried it over night. In the oven at 50 degrees. I wonder if the only option would be to run a silicone bead on the corners of it all way around. There are 4 screws on the back, removed them but I can not separate it so it must be glued too. Has anyone actually identified why these rear lights keeps getting condensation and has done a successful repair?

[Billfitz]

If the lamp isn't compromised then the source of the water would have to be a bad gasket between it and the car. That could be replaced with this: https://www.amazon.com/Insulation-St...qEALw_wcB&th=1