Foster 40-23 Duct Linear Insulation Sealer | GLT Products

Foster 40-23 Duct Linear Insulation Sealer

FOSTER Duct Liner Insulation Sealer is a water-based material specially formulated for application to HVAC duct liner or duct board insulations.  40-23 penetrates deeply into the existing insulation materials and, upon cure, reinforces the cohesive strength of the insulation materials, forming a tight, damage-resistant surface.  40-23 applied to the interior surfaces of unlined HVAC duct-work, subsequent to source removal, effectively and economically reduces particle release.


  • Non-flammable when wet and fire-resistive when dry. 
  • The dry film stays flexible and moisture resistant. It will not cause flash rusting on metal surfaces.
  • Formulated to maintain excellent resistance to the deteriorating effects of fungus or molds.
  • Contains no asbestos, lead, mercury, or mercury compounds. 
  • It meets NFPA 90A and 90B 25/50 requirements.


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