I clean the groove and metal around it out best I can, and work silicone into the seam all the way to the top, then I spray Flexseal over that. I do the same for the window.

I've got an older one that's taken a hard tumble or two over the years, and I just spray the outside seams and rivets with Flexseal now. It almost looks like camo, but it doesn't leak.

AL