Rcd Sealant 1 Gallon Mastic Air Duct Sealant Ul Listed

Product Description

The RCD SEALANT 1 GALLON is a fiber-reinforced, water-borne mastic duct sealant formulated for permanently sealing joints and seams across a wide range of air distribution components. Supplied in a 1-gallon container, this white, flexible compound carries a UL listing and is engineered for low-to-high-velocity air duct applications. It bonds to flexible air ducts, ductboard, rigid fiberglass duct, sheet metal ductwork, thermal insulation, crawl space vapor retarders, and house wrap. Licensed HVAC technicians and weatherization contractors rely on it for consistent adhesion and long-term flexibility in both residential and light commercial installs.

This sealant is suited for sealing leaks in return air ducts, supply ducts, air handlers, plenums, grilles, registers, dampers, and boots. It is also used in home performance and energy-efficiency work to reduce air infiltration into conditioned living spaces. Sealing crawl spaces and duct systems with this product supports improved indoor air quality, reduced humidity levels, and measurable energy savings. Professional HVAC contractors and home weatherization specialists use it as a standard material in duct sealing and building envelope work.

Key Features

• Fiber-reinforced formula provides flexibility and long-term joint integrity
• Water-borne, white compound suitable for brush, trowel, palm, extrusion, or spray application
• UL listed for use on UL-listed air duct systems
• Rated for low-to-high-velocity air duct applications
• Bonds to sheet metal, ductboard, flexible duct, insulation, vapor retarders, and house wrap
• Supports duct sealing, crawl space sealing, and air infiltration reduction in one product

Compatibility

Designed for use on flexible air ducts, rigid fiberglass ductboard, sheet metal air ducts, thermal insulation, crawl space vapor retarders, house wrap, and UL-listed air duct assemblies in residential and commercial HVAC systems.

Installation Notes

Applied by licensed HVAC technicians or weatherization contractors using a brush, trowel, palm application, extrusion gun, or spray equipment. Power down the air handling system and verify zero airflow before applying sealant to duct joints or seams. Allow adequate cure time before restoring system operation. Work in accordance with applicable mechanical codes and manufacturer surface preparation guidance.

Technical Specifications

• Product Type: Fiber-Reinforced Mastic Air Duct Sealant
• Container Size: 1 gallon
• Color: White
• Base: Water-borne
• Velocity Rating: Low to High Velocity
• Listing: UL Listed
• Application Method: Brush, trowel, palm, extrusion, or spray

Standard Information

• Brand: RCD
• Manufacturer Part Number: SEALANT 1 GALLON