I would never use it on sails, wrong material. On Sunbrella it works a treat. Every boat detailer I've met uses some variation on the theme, 30 second off is the most popular though, why I couldn't say. Pre-wetting the top proper rinse and seal with fabric guard when dry or you'll have to do it again soonish. Properly treated and sealed and then just stay on top of it with soap and water and re-sealing as needed in the future. I did a few tops myself this year, nasty slimy green ones at that.Yeah man. I read it both times you posted AND when first introduced in post 3 or 4 as well. Was seeking first hand experience.