I have a 12,000 square foot roof and just used forty five-gallon buckets coating my roof. I have used a similar product for the past 17 years, but nothing comes close to this product. In the past every time it rained, I became agitated and could not sleep worrying about water damage to ceilings from the leaking roof. Now, due to this product, I look forward to the rain; the harder the better. Although no one has approved the method, I have found that by adding sand to the product, I can create a flexible patch that fills small dips in the roof that tend to hold water and cause damage over time. I found I can build up areas around vents and air-conditioning stands also by adding play sand. I add sand until the product forms a thick paste, then I trowel it on. Let dry a few days then paint over with a final coat without sand. Overall I paint three coats in areas where water tends to stand for a few hours and two coats on the rest of the roof. I have tried everything on my roof in the past and this is the only product that works without peeling eventually due to some persistent standing water. I am slowly working on filling all low areas with the sand method then re-coating. Originally I was going to only use the product on the wettest areas then use a cheaper product on the remaining, however, I discovered that I got a superior coverage by this product that actually saved me money. Last time I coated the roof it took 60 five-gallon pails with another brand.