Q.: Why is waterproof curing paper considered the best curing method and curing compounds considered the poorest, assuming, of course, that proper application procedures have been exercised in the application of both?

A.: Waterproof curing paper is one of the best curing methods though not necessarily the best. Any curing method which makes additional water available such as immersing in water or covering with wet burlap is generally better than curing with waterproof paper. Curing compounds are considered less effective than curing paper or polyethylene sheet because they do allow a certain amount of water vapor to evaporate through the film thus reducing the internal relative humidity slightly below its most effective level of 100 percent.