Industry News

New Water-Based Liquid Flashing Exceeds AAMA 714 Standard

APV Engineered Coatings, makers of NeverFade® Façade Restoration Coatings, adds to its building products offerings with BLOCKSEAL™, a water-based, waterproof liquid flashing that seals window and door substrates in new and existing residential, commercial, and industrial applications. It is one of the few liquid flashing products to meet and exceed AAMA 714-19, Voluntary Specification for Liquid Applied Flashing Used to Create a Water-Resistive Seal around Exterior Wall Openings in Buildings.

BLOCKSEAL™ Liquid Flashing is a low-VOC, fast-drying acrylic adhesive that keeps moisture from penetrating door and window openings beneath a structure’s exterior façade. Its high resin content provides excellent adhesion to the substrate, eliminating any possibility of moisture penetration.

“The tight, waterproof seal shuts out moisture, considerably extending the life of the building exterior,” said Ernie Porco, Product Application Engineer with APV Engineered Coatings. “BLOCKSEAL protects the structural integrity of the building by reducing the potential for mold growth and freeze-thaw damage that can occur beneath the exterior façade.” 

Bonds to a Variety of Substrates

BLOCKSEAL™ can be applied to a wide variety of surfaces, including weathered wood, shakes, plywood, clapboard, primed metal, galvanized metal, urethane, polyester, adobe, brick, stucco, masonry, slate, and slab. It also can be installed on concrete, including green concrete that has set but has not appreciably hardened.

“For appropriate adhesion, surfaces should be cleaned prior to application to remove any previous coatings, dirt, grease and other foreign materials,” Porco said. “It is especially important to remove mold, mildew and algae from the surface, because, while BLOCKSEAL™ resists mildew growth, it will not kill mildew already on the surface.”

Contractors can apply single-component BLOCKSEAL™ using a brush or roller. A wet film thickness coat between 10-16 mil is recommended, and a minimum of four hours of dry time is required before applying a compatible paint or other finish coating. Because BLOCKSEAL™ contains grit, contractors do not need to cast sand on the surface after application. Spills and tools can be easily cleaned with warm, soapy water.

Continued Innovation in Coatings Technologies

BLOCKSEAL™ is the latest innovation to come from APV Engineered Coatings, a company that offers advanced coatings technologies, custom equipment engineering, contract manufacturing and global product distribution. Unlike some other suppliers of liquid flashing products, APV’s lean, responsive manufacturing and distribution capabilities allow it to supply BLOCKSEAL™ with lead times that are half of others in the market.

“APV has been serving the building products industry for more than 100 years with leading brands including NeverFade®, KAPGUARD® and VYNGUARD®,” Porco said. “We understand the needs of architects, specifiers, and contractors for delivering high-quality products in an unprecedented timeframe. BLOCKSEAL™ is another excellent example of the innovative solutions we bring to this market.”

For more information, call 800-772-3452, visit and follow us @APVCoatings.