Very satisfied with the product. Bought the product to seal my 900 sq swimming pool deck which was never sealed before. Started by using a 3/8 nap roller but found it to be too time consuming and not getting full saturation on the surface unless used a lot of the product. Ended up buying two garden sprayers and completed the job by spraying. As others have said, the acetone in the product will attack the rubber supply hose of the sprayers. If you have a very large are to cover, investing in an acetone proof sprayer may not be a bad idea. Was able to apply two coats using two and a half 5-gallon drums and two garden sprayers. Do not store material in the sprayer overnight. The acetone smell is very strong so wearing a good face mask and gloves is a must. Excellent waterproofing. After drying the deck surface had water just bead off the sealed surface.