Colored interior concrete flooring

[Chris Weiler]

Has anyone dealt with colored interior concrete flooring before? I am doing a fix and flip and 90% of the concrete looks great. In heavy traffic areas the red color has been worn to the original grey concrete color. It does not look good and something has to be done. Has anyone had luck matching the existing color and just "touching up" the worn areas? The cost to sand all the concrete and re-stain is around 4.5K and I'm trying to avoid that. Thanks!