One-Part Pourable Sealant

One-Part Pourable Sealant

Why M-Thane™ One-Part Pourable Sealant?

M-Thane™ One-Part Pourable Sealant is a moisture cure, self-leveling sealant that is suitable for application in damp and cold climates, as well as dry climates. M-Thane™ One-Part is solvent-free, contains no isocyanates, and will not shrink upon curing. It does not “outgas” or bubble on damp surfaces as urethane sealants can do. M-Thane™ One-Part is elastomeric and has excellent adhesion to most construction materials. It has a low durometer, which accommodates greater movement in penetration seals than typical urethane sealants.


Suitable for use in all types of climates, the additional benefits of M-Thane™ One-Part Pourable Sealant include:

  • No mixing required Solvent free
  • Less than 25 g/L VOC 100% solids
  • Will not shrink and no outgassing on damp surfaces
  • Application at temperatures as low as 30°F (-1°C)
  • Self-leveling provides smooth, professional finished look 20-minute skin-over time; paintable within 24 hours


M-Thane™ One-Part Pourable Sealant is a moisture cure, self-leveling sealant designed for use with the M-Curb™ Pitch Pan System and M-Bond™ Adhesive/Sealant on asphaltic built-up (BUR) and modified bitumen (SBS & APP) roof systems.


Black, White

Product Properties

Available Sizes

Note:  Product sizes, dimensions, and widths are nominal values and are subject to normal manufacturing/packaging tolerance and variation.
  • Container Sizes
    .53-gallon (2 liter)
  • Container Sizes
    28-ounce (825 mil)
Contact GAF Contact GAF
Professional Installation Find A Contractor
Pricing and Where to Buy DISTRIBUTORS & RETAILERS