[Paul Kassander]

Typically stamped concrete will have the color all the way through (i have never heard of anyother way)with the release agent on the top that adds the depth to it. You should be able to wash it with a mild soap to remove any oils and stains then re-apply the sealer to it and rejuvenate the color and gloss. I did this on my patio last year ant it turned out great. I just used a clear sealer on it and it looked like new and blended seamless ly with the areas that did not completly wear off. Check your local concrete plant or supplier and they will more than likely have the product you need. If not call and I can get you the name of the product I used.