Fiberlock SerpiMastic Heavy Duty Asbestos Encasement Coating is a professional-grade, water-based mastic coating engineered to encapsulate and protect asbestos-containing materials (ACM) and other friable insulating surfaces. With a high-solids, high-build formulation, it creates a durable protective membrane that helps prevent the release of hazardous fibers while shielding surfaces from moisture, impact, and environmental exposure.

Designed for both interior and exterior use, SerpiMastic provides long-lasting protection on a wide variety of substrates, including thermal system insulation, HVAC components, cementitious surfaces, fireproofing materials, textured ceilings, and other building materials requiring encapsulation. Its excellent adhesion eliminates the need for a primer on most clean, sound surfaces, while its weather- and UV-resistant finish withstands demanding environments.

The low-VOC, water-based formula is easy to apply using a brush, roller, or airless spray equipment, allowing contractors to choose the best method for their project. Its exceptional impact resistance and chemical resistance help extend the service life of encapsulated surfaces while reducing the risk of physical damage and fiber release. For deteriorated insulation, SerpiMastic can also be used after repairs to create a continuous protective barrier.

Ideal for asbestos abatement and facility maintenance professionals, Fiberlock SerpiMastic Heavy Duty Asbestos Encasement Coating delivers dependable encapsulation performance, helping preserve existing materials while providing a tough, protective finish for demanding commercial, industrial, and institutional environments.

Key Features

• Water-based, high-solids encapsulating coating for asbestos-containing materials
• High-build formula provides outstanding impact, weather, and UV resistance
• Suitable for both interior and exterior asbestos encapsulation applications
• Adheres to a wide variety of construction and insulation surfaces with low VOC content
• Can be applied by brush, roller, or airless spray for versatile installation methods