Automotive paints and relative humidity. Say wut?

I wouldn't ever get down on anyone for clearing under the hood because if you are using a 2 stage system you have to clear it or it is not only matte in shine but the color isn't correct until you clear it. With metallic paint, clear is the way to go because getting it stripe-free and shiny is not easy with a single stage.

But that said, getting back to the OP, I guess humidity is kind of a mystery when it comes to speeds...