Surface Retarder Material:R20 5 Gallon Sound: No system should be

Sound: No system should be placed on concrete or cement-based products that are flaking or spalling

above-grade exterior surfaces

If you order this product during the winter months while the weather is below freezing

air-filled cell structure is designed to resist and quickly release moisture

At Hard Rock

Surface Retarder Material:R20 5 Gallon Sound: No system should beR20 HORIZONTAL SURFACE RETARDER is a water Based liquid that when sprayed on fresh soft concrete will retard the cement and expose the aggregate to produce a three dimensional surface and will retard the set of the surface cement between 12 to 24 hours after application when applied as directed. The amount of retardation will be influenced by the concrete setting time which, in turn, is influenced by air temperature, mix design, slump, wind, concrete