I did extensive research prior to using this. At the time, it seemed like a good, durable product. The only criticisms I'd seen had to do with difficulty in applying, not with durability. I should have listened when the Salesman at Home Depot warned me. It went on great and looked amazing. That was Sept 2013. Now that spring has arrived, its cracking, peeling and bubbling. It looks like crap.

I have a big problem with black & green mildew, mold, moss because I live on a wooded lot, no grass. When the UPS guy slipped on my concrete porch I figured I had to do something and I didn't want to pay a bunch of money for someone to come power wash yet again. I have a 225+ foot concrete driveway, a concrete porch, brick paver back patio, and flagstone patio. And my house is cedar. All of those tend to get moldy. I sprayed this stuff on about a month ago and it made a noticeable difference in several weeks. I wasn't sure if it would work in the winter, but we had a cold January with some snow and it did fine. It worked best on the concrete, pretty good on the flagstone, not as good on the brick (though to be fair there is a lot of moss on them) and it kind of strips the stain off my wood siding along with the mildew (which is okay for me since I need to re-stain anyway). I did another application today to reinforce what is already on there. My only problem is that 6 gallons, which this container makes up, really doesn't go very far. I managed to do the porch (about 200 sq. ft.) twice, the brick pavers (about 150 sq. ft.) twice and several large flagstones and a small part of the driveway (maybe 50 sq. ft.) once. I have lots of plants adjacent to these areas, so the fact that this stuff is plant-friendly is a plus for me, in addition to not having to scrub or power wash.