Costar Dampmaster 20 is water-based injection silane which when injected into the mortar course, diﬀuses within the damp wall to form a Damp Proof Course (DPC), will allow the wall to dry and block future rising damp.
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Costar Repel SP protects the surface against rainwater penetration without changing the aesthetic appearance of the substrate. It is solvent-free and water-repelling. It is suitable for use on all types of masonry including concrete, brick, and stone surfaces that are both absorbent and dry to ensure an eﬀective, protective layer against penetration of rainwater.