balrgn,
I have been resealing the belt line as I go....
after removing silver silicone
Here is the process I have been using; I remove the blue plastic insert, drill out the rivets, scrape, and chemically remove the silicone, clean the back of the rail, reinstall with a light 1/8" or so bead of vulkem on the back side of the rail just above the rivet holes, then after it is installed use parabond along the top edge of the rail. I leave the bottom open for any moisture that happens to get trapped to be able to work its way out.
Aaron