I'm installing corner moldings 33x33 mm in the window reveal in a bathroom. It seals best if you nail from both sides, but then it's a hassle when you have to remove it and the nails are at 90 degrees. On the wall, I have 13 mm gypsum (+ mat), in the reveal 11 mm gypsum.
So: should I nail from one or both sides???
Then I thought (after installation) to run a thin bead of silicone between the wall and the list. OK?
Regards,
/Sven E