Green Bluebird Goop

All the window frame skins are removed. At this point I need to go buy some steel so I can raise the roof onto something, since I am fresh out of skyhooks.
I have no idea what this green goop is? I’d like to get more of the same when installing new sheetmetal. If its not cheap or easy to come by I’ll probably stick with a common seam sealer I suppose.

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