I coated the PTO of my vehicle with an industrial grade coating. It is not readily available. Sold at construction supply distributors. Comes in different colors and brands. It is a roller applied coating. Very good at keeping water out and protecting the TPO from sunlight. Most of the products available are urethane based. Should be compatible with the PTO material. Surface must be clean and dry. If you find a waterproofing products supply distributor in your town; ask about a traffic coating or a roof coating. All are quite pricey. Hope this helps.