Some 5 or more years ago I purchased a bottle of "Aged Concrete", but the table on that bottle is now gone. It was a water based paint, and I knew that the small bottle would not be enough to paint all the concrete station platforms I was making. I painted a wide, flat stick of balsa wood with 3 coats of the Aged Concrete, then took it to our local True Value hardware store. They used their "color analyzer" machine, then mixed me a quart of the stuff, in latex paint. Worked out fine.
All you need to do is find a color that you like, then have it analyzed, and a quart mixed for you.
