I had such hopes for my deck! What a disappointment Behr exterior stain was. I followed all of the instructions, which included cleaning off the deck with a chemical and scrubbing every inch of it with a stiff brush, as well as getting rid of mold/mildew stains with yet another Behr product. After all that work was done, we stained, only to have the new stain wear through in less than a season. A year after I redid the deck, it looks just as bad as before I started. I will never use this product again, and the next time I do the deck, no way am I stripping the last stain off with a chemical - it's power-washer all the way.