Yeah, you are right Jack... I was thinking I had seen some urethane gutter sealant; but I think you are correct that it is butyl rubber. We used to use that gooey stuff years ago putting windows in custom vans. Yucky stuff to work with.a lot of "gutter" sealant is butyl rubber
48Rob wrote:I don't recall the brand, but Lowes carries silicone in "aluminum" that matches perfectly with mill finish aluminum.
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