Film Forming or Penetrating Deck Stains We appreciate you visiting Deckstainhelp.com as we continue to be your go-to source for the latest in deck restoration news and trending topics through 2024. Below, we talk about Film Forming vs. Penetrating Deck Stains. Feel free to leave a comment below with any pictures you may have. A wood deck can be subjected to tough weather conditions. Deck floors are subjected to the excessive friction caused by heavy foot traffic. Because the flooring and tops of the handrails are horizontal surfaces, they are more exposed to harmful UV rays and moisture than the vertical surfaces of the deck. This constant moisture followed by drying out, along with fluctuating temperatures causes the wood to …