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MasterSeal 521

Polymer modified cementitious, durable, waterproof coating.

MasterSeal 521

MasterSeal 521 is a two-component, acrylic modified, cementitious coating that requires only on-site mixing to form the ideal product to provide a durable, waterproof coating to re-surface concrete, masonry, and most other construction materials. MasterSeal 521 imparts the natural concrete appearance.
MasterSeal 521 provides an effective barrier to water-borne salts and atmospheric gases.
MasterSeal 521 is designed for application by brush or spray; however for filling larger depressions, it can be mixed to stiffer consistency and applied by trowel.



  • To re-face and even out variations in concrete surfaces
  • As a waterproof coating for water-retaining structures like water tanks, pools, er etcs ev.o.ires
  • To provide foundation protection
  • As a backing to marble and granite to prevent water ingress, and thus alleviate surface staining
  • To provide protection to concrete surfaces from carbonation and chloride attack
  • For use on pedestrian walkways in marine areas

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