Has anyone heard of or used an anti-skid paint called Durabak or Ultra Tuff? Both of these are industrial products marketed to cities and military. The web site says they are one part polyurethane acrylics that have a rubber crumb in the paint to act as a anti-skid. They are supposed to be UV and chemically resistant, sprayable, rollable or brushable and flexible also. This sounds like a good marine application. Any word?