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Thanks for all the comments folks. Was hoping someone knew. I've contacted TechShield for their take on it. If I hear back from them I'll post their response. I'm out for now.

If you are correct then spraying foam over the shiny will have the same (negative) result. Which do I believe; that there is no way around the moisture problem or there is, because some builders are using spray foam as a solution? Seems to me if spray foam against the shiny prevents moisture...

<<<<How is painting it going to alleviate the vapor barrier location (moisture) issue?>>>> There won't be any moisture if there is no airspace. Directly applied paint will eliminate the airspace/moisture problem.

Yes, I know painting the shiny will defeat the purpose of radiant barrier.

What would be the best way to paint over an existing radiant barrier sheathing wall surface (the shiny side)? Would a sprayed on latex paint work? I have a building with radiant barrier (TechShield) installed; shiny face inside. I need to insulate this building. Using foam board or fiberglass...

Ooookkkaaaaay. Looks like this is a dead end. Thanks for the replies. I'm out.

Agree to disagree.

Can't vent outdoors. Need a solution within a foot or so from the exhaust port.

I have a 50x50 x20 metal building. Insulated. I live in an RV and in the winter I move the RV indoors. I need to find a way to capture the propane furnace exhaust moisture before it gets in the garage atmosphere. I need a method of condensing the exhaust as quickly as possible after it leaves...