Beyond 3,000°F (1,650°C)
Temperature resistance
Built for demanding thermal exposure across common construction substrates.
Protective coatings
Heavy Duty Undercoating
A one-part fire-resistant encapsulant for interior and exterior applications across wood, drywall, concrete, metal, steel, OSB, and timber beams.
Performance
Fire performance backed by test reports
The undercoating combines high-temperature resistance with documented surface-burning and wall-assembly results.
Class A
ASTM E84
The tested coating over fiber-cement board recorded flame-spread and smoke-developed indices of zero.
1 hour
ASTM E119
The tested non-load-bearing wall assembly met the requirements for a one-hour fire-resistance rating.
ASTM results apply to the assemblies and test conditions described in the linked laboratory reports.
Application
One part. Multiple substrates.
Specify and apply the coating across a broad range of building materials without a multi-part mixing step.
Wood & OSB
Wood panels, framing, and timber beams
Drywall
Interior wall and ceiling assemblies
Concrete
Cementitious boards and concrete surfaces
Metal & steel
Structural and fabricated metal surfaces
Document library
Technical documents and test reports
Review application guidance, safety information, and the complete ASTM E84 and ASTM E119 reports.
Technical data sheet
Product properties and application guidance
Safety data sheet
Handling, storage, and safety information
Product one-pager
At-a-glance product and application overview
ASTM E84 test report
Class A surface-burning result over fiber-cement board
ASTM E119 test report
One-hour non-load-bearing wall assembly evaluation
Project support
Request a coating sample
Share your substrate, application environment, and performance requirements with our team.