Have a couple of small repairs I need to make on the gunite stairs. One where the Kreepy grinded into them over the years and another 3" x 3" section where a thin sliver of gunite came loose. Leslies recommended I use non-sanded grout since I could pretty much match the color of the gunite. They also suggested e-z patch pool plaster but the color would not match nearly as well. Has anyone used grout the patch a section of gunite? Thanks for the help!