Instructions state that 1 gallon will cover about 1000 square feet of sand or flag stone flooring. I gave my 770 square foot lanai 2 coats as recommended, and my 35 square foot front porch 3 coats and still had some left over. I used a foam paint roller overall and the applicator for the edges.
Worked great on chipped and honed travertine stone floor, easy to apply by us amateurs, made floor look great, 1 gallon did 3000 square foot per application.