Good Luck with the resurfacing. A couple of suggestions I wish I did: 1) DO NOT USE A COLOR ADDITIVE. I had to do my patio in 2 batches, it was a large area 25' X 10'. I used teh color additive and I could not get the color to match perfectly. I ended up doing another slim coat over the entire surface. Now I am happy with it. 2) Use a good quality squeegee and finishing trowel. I tried to go the cheap way and wish I had bought the better quality tools.
One more thing.. although the package says 20 min. working time, you actually have longer.