Mark: I don't recall. Probably the first on a website. Try a small area and see if the color is acceptable after setting. I had a shade problem with some product (I can't remember the name) which now looks like scale. I don't recall it setting all that fast either.
I would suggest using what you are comfortable with, and since you are draining, you will have time. I recall having some repairs difficult to stay put (walls), which required layers to get a smooth finish, but I was hanging upside down, over the edge, in the deep end. I used a rubber tile float to apply it and I probably mixed it wrong, but it still looks unnoticeable, knowing where it was applied.
It seems slow on the site today, I would guess many are working on their pool, maybe somebody will chime in later.
Good luck, and please let us know how you make out.