Two. Yesterday morning, I rented a gas pressure washer from HD and invested four several hours to the deck pressure washing it. I pump-sprayed the deck cleaner in sections, rapid scrub by using a nylon brush, then waited five minutes then electric power washed. After you use PPG Pro Earlier, http://local-deck-staining60369.blogdigy.com/a-biased-view-of-huntersville-north-carolina-deck-painters-residential-painting-contractors-12696302