Foster 30-36AF Sealfas Coating AF | GLT Products

Foster 30-36AF Sealfas Coating AF

Foster® 30-36AF™ Sealfas® Coating AF is a white, fire resistive, tough, washable, abrasion resistant indoor coating for thermal insulation. It is also used as a lagging and lap adhesive for canvas and glass lagging cloth. It has excellent brushing characteristics which will result in better coverage and more uniformly coated surfaces. It presents a neat white finish, and will not yellow or become discolored with age. The surface can be washed free of grease, oil, soot, and other dirt accumulation.


  • Provides a protective finish for insulation on air conditioning ducts and cold water piping when applied in 2 coats with 20x20 white glass cloth embedded between coats. 
  • When relative humidity exceeds 75% for continuous periods, an additional coat of vapor barrier protection such as Foster 30-80 or 60-95 is suggested.
  • Offers the same proven qualities of standard Foster Sealfas Coating 30-36 with the added benefit of excellent fungus resistance.
  • Meets NFPA 90A and 90B 25/50 requirements and is compatible with polystyrene and polyurethane foam insulations.
  • No asbestos, lead, mercury, or mercury compounds.

 Suggested Use:

  • Lagging: Best

Insulation Type:

  • Fiberglass and Mineral Wool: Best
  • PIR/Polyurethane/Phenolic: Good
  • Cellular Glass: Good
  • Polystyrene: Good
  • Calcium Silicate: Good
  • Rubber Foam: Good
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