We finally finished everything up, let the grout dry and cure, and caulked around the tub. I used the shower with no plastic over the tile for the first time this morning, which, of course, gave me plenty of time to examine my workmanship.
I found a few little bits of grout on the tile faces that I was able to scrape off with my fingernail. I also noticed that the grout turns much darker when it gets wet, and when I rubbed one of the grout seams with my finger, I was able to get a little cloudy water on my finger. The grout seems hard enough otherwise and dried fairly quickly (returning to it's normal color).
Does grout mixed with Grout Boost ever need to be sealed?
No. Since Grout Boost is mixed with the grout, the stain resistance is throughout the grout and can not erode like a sealer.
This is what it ended up looking like:
Click for large version.
Is the color change normal for unsanded grout? I am unsure as it didn't happen with the tile we took out. Also, is it okay I was able to scrape some leftover grout off the tile? I want to be sure my grout dried and cured properly.