We had previously sealed our flagstone patio using a roller brush and a different product with a lot of time invested and disappointing results. We did a lot of research before deciding to spend a little more money and buy this product to help protect our investment in our large flagstone patio. I was pleasantly surprised by how quick and easy it was to apply using a Scott's multi-use sprayer, which had been recommended for use in application. After cleaning the flagstone and applying the Foundation Armor sealer, our patio looks restored and protected.