I live in Chicago and I am building a new deck. I will be using a product that contains copper naphthenate: Coppercoat Green Wood Preservative on the framing of the deck.
I plan on using the Coppercoat Green Wood Preservative on the Underside of the decking boards and Defy Wood Stain on the Top of the boards.
If I do this, will the Coppercoat interfere with the absorption of the Defy Stain?
Or should I use the Defy Wood Stain on both the Top and Underside of the Decking boards for best protection from mildew and moisture?