I made gaskets for my drip rails and didn't use any adhesive at all. My drip rails, the flat part that lays against the cab are black. So after I cleaned them up I painted them back black. And yeah, those screws were a bit difficult to remove and a couple of them seemed to be just under the drip rail where it curls over, and I had to angle the screw driver to get them back in. But it was just a couple of the screws. The screws were black as well. And then the part of the drip rail that curls up is brushed stainless, not chrome.
Like ya'll I need to remove mine and look to see if there is any rust under there. I don't see any evidence of rust coming out from under the rails anywhere but that's no guarantee there isn't at least some somewhere, especially around the screw holes. I'm not looking forward to fooling with the rails, coming up with a good way to reinstall them, but ya'll have given me some good ideas.