The grout in the bottom half of this shower was going bad so I removed all of the grout below the horizontal band and re-grouted.
The horizontal band appears to be water tight but it's a hot mess. The small tiles are extremely uneven and poorly aligned. Many of the gaps are extremely small. In many places, they have gone over the grout with what appears to be a grey epoxy.
My first plan was to clean it up and then apply a "Grout Renew" product on the lines. I tried that tonight and ran into major issues. The grout renew would not stick to any areas that have been covered in the grey material. Because the gaps are so small, trying to scrape it out would take forever (and if I did succeed at that, I'd just be tempted to regrout...)
I'm now thinking that maybe I can just tile over the horizontal band of tiles with a row of subway tiles in a different color. It will mean that this row of tiles sticks out further than the rest of the wall.
Is that an option? Has anyone seen that done before?