BASF Thoroseal (MasterSeal 581)

A waterproof cement-based coating for concrete and masonry 

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.


  • Waterproof to help protect building interiors from dampness and moisture damage
  • Breathable, allowing interior moisture to escape without damaging coating


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

Limitations: This product is not color uniform, adequately ventilate for proper curing in enclosed areas; not intended to be used as a wearing surface; protect surfaces not being coated; metal, glass and wood.

Technical Data:

  • Coverage Rate: 1st Coat: 225 ft2/bag; 2nd Coat: 450 ft2/bag.
  • Pot Life (70°F): 40-60 minutes.
  • Set Time (70°F): Initial: 10 minutes, final: 90 minutes.
Order Code Product Description Packaged Min Order
TSEALG50 Thoroseal Gray 50# Bag per pail 1 pail
TSEALG60 Thoroseal Gray 60# Pail per pail 1 pail
TSEALW50 Thoroseal White 50# Bag per pail 1 pail
TSEALW60 Thoroseal White 60# Pail per pail 1 pail