The retarded cement matrix can be removed as early as 4 hours and up to 16 hours depending on conditions. Actual removal time for the desired appearance varies based upon concrete mix design, finishing technique, weather conditions and grade of TOP-CAST used. Once dry (1-2 hours after application), TOP-CAST® provides good protection against intermittent rain and does not require additional cover. Spray with a low-pressure sprayer (plastic preferred) until the surface has a complete hiding coat. Apply TOP-CAST ® surface retarder uniformly to the wet concrete after the initial bleed water rises to the surface. Mix TOP-CAST thoroughly before application. Finish with a Darby trowel to keep concrete pores open for surface retarder application. Pour concrete and float or trowel finish. Alternatively, screed away excess water, and hand seed extra stone into top surface, if desired. Allow coating to dry before pouring concrete. with a coat of TOP-CAST® SS-100 surface protectant. In preparation for pouring of concrete, protect all curbs, borders, adjacent stones, pavers, etc. When pouring test samples, always simulate job site conditions as well as mix designs to be used on the project to establish the proper grade selection and procedures. Application InformationĪlways prepare small test panels to determine the most suitable grade to obtain the desired depth of etch. The retarded surface can then be removed by water or pressurized water, revealing the aggregate in the concrete mix. During the next 16+ hours of curing the bulk concrete hardens, except where the cement matrix has been retarded. The retarding chemicals diffuse into the paste during the first hours of curing and slow down the cement hydration reaction. PerformanceĮach product grade creates a unique degree of reaction to produce the desired effect on the surface mortar.
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The wide selection of grades available provides a comprehensive range of effects, from a simulated light acid wash or sand blast finish up to full exposure of 1 1⁄4 in. Ideal for poured-in-place flatwork and the top surface of precast panels. Heavily pigmented for ease of application.It is available in 12 depths of etch, each one color and number coded for safety and convenience. TOP-CAST is a water-based, top-surface retarder which does not require covering with plastic for protection.