It is not as thick since it appears to be, so it can be very easily applied to both equally vertical and horizontal surfaces. As for dilution, the manufacturer isn't going to propose doing it. In addition to, diluting related compounds to restore surfaces is not really proposed generally speaking. http://deck-staining-contractor18407.total-blog.com/the-smart-trick-of-best-deck-painters-pineville-that-no-one-is-discussing-22479262