Elastomeric Roofing - TOPCOAT MB Plus

TOPCOAT® MB Plus Membrane


TOPCOAT® MB Plus Membrane is a water-based, low VOC, acrylic, sprayable polymeric liquid, which cures to form a seamless rubber membrane. Covers and protects most roof surfaces including modified bitumen (smooth and granulated), smooth BUR, and metal. MB Plus Membrane is an ENERGY STAR® qualified reflective product that will help to reduce building temperatures. TOPCOAT® MB Plus Membrane is listed by the Cool Roof Rating CouncilSM for solar reflectance and thermal emittance. It is highly reflective, flexible and, due to unique emulsion chemistry, resists unsightly bleed-through over asphalt substrates better than solvent-based systems. Available in white (for maximum reflectivity) and custom colors. It is non- flammable, presents minimal hazard to the applicator or the environment, and cleans up with water.


TOPCOAT® MB Plus Membrane is designed to protect and restore aged roofs. This product can be used on modified bitumen, BUR, Hypalon®, metal as a primer, wood, and concrete. For use with water-based sealants and top coats only. Substrate shall not pond water for a period longer than 48 hours. Surface must be free of ponding water, ice, snow, and debris prior to application. Do not apply at temperatures below 42°F. Substrate temperatures must be below 120°F when applying product.

  • ENERGY STAR® qualified reflectivity can dramatically decrease building temperatures

  • Highly reflective and listed by the Cool Roof Rating CouncilSM for solar reflectance and thermal emittance

  • Low VOC, non-flammable, and presents minimal hazard to the applicator or the environment

  • Easier to apply than solvent-based systems for asphalt surfaces

  • Limited warranty available for up to 10 years*

  • Guarantees available for up to 10 years**

  • Available in 5-gallon pails, 55-gallon drums, and bulk totes

For application questions, please contact GAFMC Contractor Services at

Applicable Standards

ASTM D-412, ASTM D-21-96, ASTM D-1475, ASTM E-1644

Note: Repair leaks promptly to avoid adverse effects, including mold growth

*See warranties and guarantees for complete coverage and restrictions
**When used as a part of a multi-ply system

TOPCOAT® MB Plus Membrane Technical Data
Application Rate: 1.0 to 3.0 gallons/100 sq.ft. total, varies by system
Application Method: Airless sprayer, brush, or roller
Application Temp (air, surface): 42°F – 120°F
Drying Time (75°F, 50% RH):
Approximately 24 hours per coat
Wet Mil Thickness:
(1.0 Gallon/100SF) – 16 wet mils
Dry Mil Thickness: (1.0 Gallon/100SF) – 9 dry mils
Total Solids (by weight): 65% ± 2%
Total Solids (by volume): 54% ± 2%
Specific Gravity: 1.32 ± 0.1
Weight per Gallon: 11.0 ± 0.5 lbs
Viscosity (75°F): 15,000 ± 2,000 cps
Elongation: 275%
Initial Reflectivity: 0.83 (white only)
Aged Reflectivity: 0.67 (white only)
Initial Emissivity: 0.88 (white only)
Aged Emissivity: 0.85, 3 year (white only)

Initial SRI:

104 (white only)
Aged SRI: 91 (white only)
Storage: Store in well-ventilated area at 50°F to 80°F; protect from freezing
Shelf Life: 1 Year
Clean up: Water before curing

Hyphalon® is a registered trademark of DuPont Performance Elastomeric LLC.


All documents are U.S. English unless otherwise noted

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