I have a handyman installing terracotta tile in a kitchen remodel I'm doing. Most of it is looking pretty good, but the grout is having difficulty in some places; the grout was put down in two layers. Is this something that can be cleaned up, then maybe float an epoxy grout over the top? What's the best way to make it look good and last?
I've never heard of or done grout in two layers. It will lose much of it's strength. If the grout line is greater than 1/8", hopefully sanded grout was used. The grout in your picture looks as if it was prematurely dried and cracked as a result.
To fix this, get a grout saw and remove the grout down to the thinset. Mix up a small batch according to directions and re grout the area with a float. Clean the residue off the tiles and keep the grout moist for hours depending on manufacturer's direction.
There are epoxy grouts that are great but using them to patch areas wouldn't give the same effect.
Seal your new, and old grout according to directions on the grout package.