I used this product on my driveway and walkways. The directions and Tech support were GREAT! I used a roller and got about 100 to 125 square foot coverage per gallon. The driveway and walkways were growing some black stuff that needed power washing about every other year. I hope this product eliminates the necessity to power wash any more. It looks great and repels water, so I hope the black stuff doesn't come back. Time will tell.