Foster 46-10 Weatherite Mastic | GLT Products

Foster 46-10 Weatherite Mastic

Foster® 46-10™ (brush/spray) Weatherite™ Mastic is a water-based weather barrier mastic used for a wide variety of applications over most thermal insulations including polystyrene.

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


  • Tough, fire-resistive dry film 
  • Extremely flexible and smooth, attractive finish being suitable for both indoor and outdoor applications. 
  • Excellent adhesion to most foil facings. 
  • Can be used on residential low velocity air ducts as a closure joint sealant.
  • No asbestos, lead, mercury, or mercury compounds. 

For the most up-to-date SDS sheet, visit the manufacturer’s website: Foster Products

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