Ok so the windows are glass

I can do a light sanding job and then cetol. This will make it look pretty but, what should I use to sandwich the wood back together? Glue, PL400, silicone, lots of options, just not sure. Also, many years ago I used cetol on a swim platform and my next step...I just can't remember. I can't remember if that was it or if I added a urethane on top of that to make it a gloss finish.
The whole goal here it to fix the wood, make it look pretty and above all, it has the let the water follow the wood track out the weep holes and not follow the wood joints, through the cracks and back into the boat.
Any help or ideas are appreciated. This is a major problem that I have to fix!
Thanks,
Steve