I put down some industrial stuff (not UCoat-It or the stuff from Home Depot/Lowe's) I got with my friend when they were doing their shop floor. I had to mix and add the sand. I put it down on new cement which I believe made a big difference. Unfortunately, the stuff I used doesn't hold up to welding. I have little black spots where I have welded. As for the sand. They recommended mixing it in with the product. Which when applied didn't come out even. I just threw the sand over the first coat and went over. Came out more even and the floor doesn't look like grit.
Most of the floors I have seen peel, is where the material was put over older cement.
Kevin
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