Prime Retarder is a water based chemical retarder used to expose the aggregate in horizontal/vertical concrete surfaces. Prime Retarder delays the set of the surface concrete slurry to a controlled depth. It is applied using a pressure spray unit after the concrete has been finished. Prime Retarder does not stop the set of the main concrete. The Retarded concrete slurry is easily removed by a high pressure washer from 12-24 hours (subject to weather conditions) after Prime Retarder has been applied.
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