I have been putting tile down on the front porch at the Armadillo Ranch. The original concrete surface was crumbling in spots and was patched a bit making it look bad. Never done anything like this before so I was learning as I went. About 1/3 of the way into the project the tiles were getting kind of wonky but it was too late to correct things as the cement was already setting up. But things improved as I kept going. By the time I reached the end, the newer part looked a whole lot better. I still have to go back and wash the tile real well to get rid of the "grout haze" that is left behind.