You need to evaluate the surface texture first to figure how much sealer you will need. If it is rough, it may take 2 or 3 apps. If it is smooth, it may take 1 thick or 2 normal apps. We have an excellent book available through http://www.barnesandnoble.com or amazon.com called Guide to Pavement Maintenance that will teach you how to bid crack sealing, seal coating, patching, paving, slurry seal etc. Check it out
Most producers of pavement sealers recommend a minimum of two tenths of a gallon of sealer per square yard for two coats. Simply multiply the square yards of pavement to be sealed by .20 to determine the mixed gallons of sealer to be applied. Your mix design will determine hhow many gallons of concentrated sealer, water, latex and sand you will need. Please check out the product calculator on this website, or you can go to our website, gemsealinc.net for assistance, or feel free to call me if you have any other questions.