I purchased the SX5000 to seal a new flagstone patio. I read all the reviews and decided on Foundation Armor. I put two coats on in the evening of Oklahoma's 90 degree heat and it set for over 24 hours before it got wet. Then it rained, and rained, and rained. Wow! I had water bubbles everywhere. There were some low places in my patio where the water was standing. I was a little concerned that the concrete joints between the flagstone might not be sealed. (I really don't know why, the water was standing on them, but the color seemed different to me.) I called customer support at Foundation Armor and "Mike" told me to go ahead and put a third coat on the joints, it wouldn't hurt anything. So I did! It has cured very nicely and has sealed perfectly. I am SO pleased with the results of the SX5000 and the customer service that "Mike" provided for me. Buy this stuff! You won't be disappointed!