In article . net,
"Karl Townsend" remove .NOT wrote:

I'll have yards and yard of places where the metal meets that I need to
seal. It needs to hold up to vibration and high air pressure. And be
paintable. What would you use?

There is a liquid duct sealant, some sort of flexible-rubbery stuff.
Don't know how paintable it is.

Then there's household caulk, which can be had in known to be paintable
formulations.

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