Concria™ SHIELD is a water based penetrating sealer and it provides maximal water repellent (hydrophobic) waterproofing and improve chemical resistance for concrete. Shield penetrates deep into capillaries, micro-cracks and pores without forming a sealed film.A reaction then takes place between salts and minerals to form a very hard calcium silicate hydride. This results in a crystalline structure that stops the transport of water but lets vapours pass through (diffusion). Because the protection is deeply seated, it is insensitive to external influences such as abrasion and impacts. Shield leaves no topical film on the surface and will wear away only if the substrate itself wears away.