Has anyone tried "Wet it and forget it"? < http://wetandforget.com/surfaces_all...nd_forget.html
I have used it on my roof and sidewalks to keep the dark algae and mold off my roof and driveway. It lasts for several months each treatment. Before I found it, I was pressure washing my drive and sidewalks at least twice a year and my light tan colored roof was nearly black. Where I live, between Houston and the Gulf of Mexico, if it is, it molds, gets ball moss, rots or rusts.
I had not thought of using it on Wenonah until I started reading this thread.
On the website (see Link above) it says it is good for boats.
I just read the label and it says not to apply it within 100 ft of any body of water.