I have reviewed this product previously and my opinion has not changed. I use this on a block paved drive and paving elsewhere . The drive would have terrible moss etc in certain spots and nothing would stop it even in the summer. Block Blitz has managed to do it though. I have treated it three times now and even at this time of year(March) the drive would be covered in moss between the bricks, but not now, not a patch. I will continue using this product so long as it is available.