Foster 46-00 Aqua-Fas Mastic | GLT Products

Foster 46-00 Aqua-Fas Mastic

Foster® 46-00™ Aqua-Fas® Mastic is an economical water-based vinyl-acrylic weather barrier coating used for a wide variety of applications over many thermal insulations including polystyrene. It will seal out dirt and water and provide protection for the insulation.

AQUA-FAS MASTIC has excellent brush and spray properties, is non-flammable when wet and has a mild odor during application. AQUA-FAS MASTIC meets NFPA 90A and 90B 25/50 requirements.


  • White, fire-resistive dry film 
  • Flexible and a smooth, attractive, decorative finish. 
  • Suitable for both indoor and outdoor applications
  • U.V. resistant
  • Excellent adhesion to most foil facings.
  • No asbestos, lead, mercury, or mercury compounds.


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