My neighbor just had concrete curbing installed, and in their case, the concrete was mixed with a dye to color the concrete, then it was covered with a clear after the concrete cured. There have been lots of comments about redoing concrete (driveway) coatings, which are probably very similar to the curbing coatings. You might try searching driveway coatings, and see if you get some leads.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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