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    ​SikaTop®-578 Seal (formerly known as MasterSeal® 578) - An elastomeric, highly flexible cementitious waterproof coating for concrete and masonry structures

    What is ​MasterSeal 578​?

    MasterSeal 578 is a two-component, cement based, flexible coating for waterproofing and protection of concrete and masonry structures, cement and gypsum boards. MasterSeal 578 powder is a blend of Portland cements, selected silica sands and modifying agents. When mixed to a slurry consistency with MasterSeal 578 liquid polymer emulsion, can be easily applied by brush, roller or spray equipment. It cures to form an elastomeric flexible membrane. MasterSeal 578 must be reinforced with mesh across all construction joints and cracks. The reinforcing mesh may be either 100% virgin polypropylene or an alkali resistant glass-fibre mesh. Consult our Technical Service Team for further advice on the correct selection of mesh.

    What is ​MasterSeal 578 used for?

    • Suitable for internal and external applications
    • Waterproofing and protection of roofs, terraces, balconies, bathrooms and other wet areas (before tiles are installed using a proprietary tile adhesive.)
    • Waterproofing of water retaining and hydraulic structures
    • Waterproofing of lightweight cement blocks, plasterboard render and cementitious surfaces
    • Flexible protection of concrete structures subject to minor deformation under load.
    • Protection of cementitious renders and concrete with cracks (caused by shrinkage, minor movement or dynamic stresses) and against infiltration of water and aggressive elements from the atmosphere.
    • Protection of concrete structural elements repaired with products from the MasterEmaco or MasterBrace ranges against the penetration of carbon dioxide.
    • Protection of concrete surfaces from sea-water and deicing salts, chloride attack and carbonation  

    What are the benefits of ​MasterSeal 578​​?

    • High performance: accommodates movement up to 2 mm, when applied at 2 mm thickness
    • Excellent elongation at failure
    • Excellent mechanical characteristics
    • Easy application due to product’s consistency
    • Possibility to apply on existing coverings
    • Compatible with ceramic, mosaic and natural stone coverings
    • Excellent adhesion
    • Retains flexibility when submerged
    • Flexible under all environmental conditions
    • High resistance to carbon dioxide diffusion: Protects concrete from rebar corrosion. A 1mm coating provides anti-carbonation cover equivalent up to 40 cm of concrete
    • Resistant to the penetration of aggressive substances which are present in the atmosphere (such as carbon dioxide, sulphur dioxide and sulphuric anhydride) and soluble salts which are present in seawater or in the ground (such as chlorides and sulphates)
    • UV resistant, can be used as final coating in exterior applications
    • Good chemical resistance against soft water, domestic waste water, manure or other liquids moderately aggressive to mineral substrates
    • Long service life even in rigid climatic conditions like coastal or industrial areas
    • Non-toxic; suitable for use in contact with potable water​​


    MasterSeal 578_MS

    pdf (115.52 Kb)

    MasterSeal 578_TDS

    pdf (369.37 Kb)


    Oman: +968/24435800
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