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I use products such as Ardex, Henry's, Feather Finish, etc but as levelers or floor stoning (I'm covering the slab with a floor covering). I can guarantee the color of any of those products will be different from your existing concrete (darker). There are guys out there who can cap the concrete with endless options of color and textures but it ain't cheap. You could simply apply sealer which might just jazz it up enough for sale. It would certainly be the cheapest and easiest solution
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