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    SikaTop®-550 Seal (formerly known as MasterSeal® 550) - Flexible, cementitious waterproofing membrane

    How does MasterSeal 550 work?

    Flextight is an acrylic-modified, Portland cement-based flexible, waterproofing membrane for concrete and masonry. Use it above or below grade on interior or exterior surfaces.

    Recommended uses:

    • Walls and floors
    • Tiled pools and fountains
    • Plaza decks
    • Balconies
    • Mechanical rooms

    What makes MasterSeal 550 a unique solution?

    • Waterproof membrane
    • Creates a flexible membrane
    • Breathable
    • Ready-to-use kit

    How can you benefit from MasterSeal 550?

    • Protects against soil moisture and water seepage; extends life of structural slabs and underlayment
    • Accommodates substrate movement; prevents cracks from telegraphing; provides excellent underlayment for thin-set tile applications
    • Allows interior moisture vapor to escape
    • Easy to mix and place
    • Environmentally friendly; low odor