Hydro Stop has been one of the biggest sellers of roof coatings in Hawaii in recent years. It has been aggressively marketed in the islands and has name recognition. Many years ago, LeakMaster installed what we were told to be the largest local Hydro Stop installation at that time--the Unicold Building near the airport. We have installed it on other projects thru out the years because it is widely specified. It has performed well on sloped areas where there is no long prolonged water buildup. However, in those areas where there is significant ponding water we notice the coating will peel away and has to be repaired. This is common amongst many acrylic coatings and is why we prefer our own Hawaiian SunGuard which is defined as "Hydrophobic" due to it's special additives. We also believe that the Ceramic Titanium additives in Hawaiian SunGuard help to keep the coating cool and thereby last longer.