There are two main tests within ASTM C309 Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete: the Water Retention Test and Reflectance Test. These two test are performed by making a specified mortar and placing it in this rectangular pan then spraying or brushing on a curing compound such as US SPEC Wax White. Then the water loss measurements are taken and a reflectance measurement at 72 hours.