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👉 Check Latest PriceDescription Supercast SWX is a grey, elastomeric water-swellable paste which is applied like a sealant. The hydrophilic properties of Supercast SWX display good consistency in swell rate during repeated wet/dry cycling. Expansion of the product on contact with water creates a positive pressure against the faces of the concrete joint, thus preventing the passage of water. Key Features Fast curing: Enables early concrete pour and rapid return to service Allows hand-applied concrete cover within 2 hours on emergency repairs and large-scale concrete pour after 8 hours Excellent seal on rough concrete: Gives improved water tightness Plugs inequalities in rough concrete to produce a tight seal