Sand Blast is a time-release product that over a short period of time converts concrete into a wet, sandy substance that can be easily rinsed from ready mix trucks, concrete saws, concrete forms and other concrete equipment. Nonhazardous and biodegradable, Sand Blast will not harm materials such as iron, steel, copper, brass, plastic, rubber or vinyl. It is also a superior rust remover that, unlike acid-based products, will not encourage the formation of new rust. The mildest and safest effective concrete remover on the market.