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Trowel-Grade Single Component Urethane Mastic

Product Data Sheet

M-2000 Liquid Flashing is trowel-grade, cold-applied, single component urethane mastic used for detailing and termination applications with a variety of CETCO waterproofing membranes. M-2000 Liquid Flashing moisture cures to form a seamless, positively bonded elastomeric water barrier material. M-2000 Liquid Flashing contains no coal tar and conforms to the performance requirements of ASTM C 836-89a.


  • M-2000 Liquid Flashing is an accessory waterproofing product designed for the following uses.
  • Fillet material at horizontal and vertical inside corners
  • Flashing material around drains, mechanical and electrical penetrations, curbs and parapets
  • Sealing material at membrane terminations
  • Fillet material for small concrete surface substrate defects

Flashing material at inside corners M-2000 Liquid Flashing is formulated for use on structural concrete, masonry, wood and most metal surfaces. Do not use M-2000 on insulated concrete forming (IC F) systems but polystyrene foam may be installed over M-2000 after it has cured. M -2000 should not be applied to areas permanently exposed to sunlight or where it would be exposed to direct traffic conditions. Tile set in thin-set mortar is not recommended over M-2000. Use a cement-based mortar setting bed with a minimum thickness of 1-1/4” (30 mm) as recommended by the Ceramic Tile Institute.

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