BMW E61 rear light water fix damage

A little howto to fix your rear light unit when water gets into it.
I found one day that my rear light was full of water and i did not understand where it came from.
lets take a look if we can fix this.
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[@noisy5109]

How did u remove the glass? Did u heat it up or it just came off? Got the same issue now!

[@asyrafrosli3945]

What type of glue is that mate? Is that specific to glue car lenses?

[@donadami2017]

Epoxy adhesive, a few brands around.