Foster 46-50 Weatherite Mastic | GLT Products

Foster 46-50 Weatherite Mastic

Foster® 46-50™ Weatherite™ Mastic is a non-fibrated water-based breather mastic. It features a bright white color and extremely smooth, creamy, thixotropic consistency for fast, easy application.

WEATHERITE MASTIC complies with current requirements regarding use in meat and poultry processing areas under federal inspection. Letter of certification is available upon request. WEATHERITE MASTIC is produced under the classification and follow-up service of Underwriter’s Laboratories, Inc. and meets NFPA 90A and 90B 25/50 requirements.

WEATHERITE MASTIC has excellent brush, trowel, and spray properties, is non-flammable when wet, and has a mild odor during application.


  • A tough, fire-resistive dry film
  • Extremely flexible and provides a smooth, attractive finish on both indoor and outdoor applications.
  • It has excellent adhesion to most foil facings. 
  • May be used over a wide variety of thermal insulations including polystyrene and rigid polyurethane board stock insulations.


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