Hi Samuel - That is a great question about how to apply Penofin. There are two products that will help prepare the deck for Penofin: Step 1 [Penofin Pro-Tech Wood Stripper](https://www.diyhomecenter.com/penofin-pro-tech-stripper-step-1-restoration-system-1-gallon) removes oil-based wood stains, sealers & loose wood fibers.
Step 2 [Penofin Pro-Tech Wood Cleaner](https://www.diyhomecenter.com/penofin-pro-tech-cleaner-step-2-restoration-system-1-gallon) removes organic stains and grime. Thank you for your question about Penofin.