Product Details: Rugasol C is a liquid retarder for horizontal construction joints and surfaces for use in cooler conditions or low retardation conditions. Rugasol C is an easy to use, economical product applied to obtain a mechanical key for kicker joints, renderings and screeds on horizontal surfaces of freshly placed concrete. Rugasol MH is a gel retarder used mainly for on-site exposed aggregate work. Rugasol MH surface retarder is used to expose aggregate on formed Portland cement based concrete surfaces, both vertical and horizontal.