I should have checked, but was too lazy. I was assuming that you were simply using space.
I'm caulking with "Alex Plus" acrylic latex caulk plus silicone. One of these years I need to have the roof redone as well as painting, but I can't afford this until probably summer 2020.
I wonder if one of the polyurethane kits would last longer. I don't know, so this is not of much use to you 8-).