Masterseal 581 is a Portland cement-based coating for concrete and masonry that resists both positive and negative hydrostatic pressure. Polymer-modified with masteremaco a 660, masterseal 581 creates a low maintenance and highly durable waterproof barrier. 

Product Highlights

  • Waterproof to help protect building interiors from dampness and moisture damage

  • resistant to both positive and negative hydrostatic pressure, making masterseal 581 suitable for use below grade interior and exterior and in water treatment construction

  • Breathable, allowing interior moisture to escape without damaging coating

  • Compatible with high-performance coatings, including a wide range of architectural coatings and textured finishes

  • hides minor surface defects and blemishes in architectural concrete

  • available in ten landscape colors and custom colors (with minimum order quantities)

  • Certified to the NsF/aNsI standard 61 for potable water contact 


  • Vertical and light-pedestrian horizontal surfaces

  • Interior and exterior

  • above and below grade

  • alternative to mechanical finishing or rubbing of concrete

  • Waterproofing basement and retaining walls

  • Foundations

  • Bridges and tunnels (non- traffic barring surface)

  • Water cisterns 


  • Cast-in-place and precast concrete

  • Block, brick and porous stone