I used pressure treated plywood too, but after I cut the pieces, I put them in large black plastic garbage bags, laid them flat on the floor and poured in Thompsons water seal until it was covered... Sealed the bag and flipped every morning for a week... Sun dried for 48 hours, with a coat of polyurethane and some silica sand while wet... A couple uncarpeted areas of the deck are still uncovered after 8 years and holding up well...