Legacy Industrial's "HD37™" is a super reactive lithium based densifier with double the standard amount of lithium. Mop, roll or spray onto the substrate and watch it work. Helps to eliminate staining, water/radon transmission and effloresence. This is the least expensive lithium densifier with the highest quality and deepest penetrative ability.Coverage: up to 800 sq ft. per gallon when diluted. Use full strength for old or soft concrete.