I use this product to create a water proof membrane when I build masonry/tile showers and bath tubs. I have owned this box cargo trailer since 2008 and it leaked when I purchased it. I painstakingly scraped off the old sealer then and applied new roof sealer but it began to leak again. Frustrated I just let it go until the floor needed to be replaced. I then used flex seal in a can about a year ago and that didn’t work. I recently used this product and finally something that works. Total of 25min two coats. Hope this helps. Please subscribe!