Rear taillights Flooded

The rear taillights are floating in the water, two fingers thick, no matter where you took the water. Also, do I need to silicon the edges of the stops with silicone so that no water can enter and steam.

Hi, if you click on the link below, I hope our friends have explained the solution ways they told you.

http://forum.peugeotturkey.com/forum_posts.asp?TID=20180&title= rear-stop-lambas