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MasterSeal 581 White Cement-Based Waterproof Coating 50 lb
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Vendor:
MasterSeal
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Description
Description
MasterSeal 581 is a Portland cement-based waterproof coating designed for concrete and masonry surfaces. It resists both positive and negative hydrostatic pressure, helping to keep water out even when moisture is pushing from either side of the structure.
Polymer-modified with MasterEmaco A 660, MasterSeal 581 creates a low-maintenance, highly durable waterproof barrier that protects building interiors from dampness, moisture, and seepage.
Features & Benefits
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Portland cement-based coating for concrete and masonry
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Resists both positive and negative hydrostatic pressure
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Polymer-modified with MasterEmaco A 660 for enhanced performance
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Creates a durable, low-maintenance waterproof barrier
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Breathable coating allows interior moisture to escape without damaging the surface
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Compatible with many high-performance architectural coatings and finishes
Typical Applications
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Basements and foundation walls
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Retaining walls and below-grade structures
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Interior and exterior masonry and concrete
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Water cisterns, tanks, and other water-retaining structures (when mixed and applied as directed)
Specifications
Specifications
Product Type: Portland cement-based waterproof coating
Color: White
Weight: 50 lb (22.7 kg) bag
Substrates: Concrete, masonry, brick, block, porous stone
Hydrostatic Pressure: Resists both positive and negative pressure
Polymer Modified: Yes — designed for enhanced adhesion and durability
Coverage Per Bag:
• Base coat — approx. 225 sq ft
• Additional coat — up to approx. 450 sq ft (surface dependent)
Application: Brush or spray; minimum two coats recommended
Use Locations: Interior or exterior; above-grade or below-grade
Suitable For: Basements, foundations, retaining walls, water tanks, cisterns, tunnels, and other water-retaining structures
Breathability: Allows moisture vapor to escape while blocking water intrusion
VOC Content: 0 g/L
Shelf Life: 12 months in original unopened packaging when stored properly
Not a traffic-bearing surface (use only on vertical or non-pedestrian surfaces)

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