MasterSeal 550 - An acrylic reinforced cementitious, flexible waterproof coating

Formerly Masterseal 550

How does MasterSeal 550 work?

MasterSeal 550 is a two component acrylic modified cementitious coating that requires only on site mixing. Once mixed the product is applied by stiff brush, roller or trowel to form a waterproof, flexible protective coating. MasterSeal 550 provides an effective barrier to waterborne salts and atmospheric gases.


Fluid applied, MasterSeal 550 provides a hard wearing, seamless, waterproof membrane for roofs and foundation protection.

Where is MasterSeal 550 applied?

MasterSeal 550 is designed for use for the following applications:

  • To reface and even out variations in concrete surfaces.
  • As a waterproof lining for water retaining structures.
  • For coating seawater channels.
  • Sealing and coating tie bar holes to ensure watertightness.
  • For waterproofing and protection against brackish water.
  • To provide foundation protection.
  • As a waterproof coating for roofs.
  • As a backing to marble and granite to prevent tile adhesive mix water absorption and thus alleviate surface staining.
  • To provide protection to concrete surfaces from carbonation and chloride attack.
  • For use on pedestrian walkways in marine areas.

What are the advantages of MasterSeal 550?

MasterSeal 550 offers the following advantages:

  • Waterproof
  • Excellent adhesion.
  • Bonds to porous and nonporous surfaces.
  • Flexible.
  • Non toxic suitable for contact with potable water.
  • Suitable for light pedestrian traffic.
  • Breathable - whilst repelling water, allows substrate to breathe.
  • High resistance to chloride ion diffusion.
  • Unlike conventional coatings which require a 7- 28 day cure of concrete, MasterSeal 550 can be applied to 24 hour-old concrete thereby giving immediate protection.

Product Information

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