AU-1 is a highly elastic, non-sagging, high-performance construction sealant with extreme resistance to aging. Uniquely formulated from state-of-the-art ingredients, including Aqueous Polyurethane Dispersion (PUD), which makes it an ideal sealant for commercial and industrial applications. AU-1 requires no mixing or priming to bond at the molecular level to most construction caulking materials. AU-1 is a paintable sealant and will never bleed through the paint finish or create tacky surfaces, making it resistant to dirt pickup. Once cured AU-1 is exceptionally resistant to mold and mildew. AU-1 has outstanding UV resistance and maintains high elasticity and adhesion in all climates even after years of exposure. It is VOC compliant nationwide including all CARB and SCAQMD requirements. AU-1 does not lose elasticity under dynamic mechanical stress.

A single component, modified acrylic urethane, AU-1 is a premium sealant that is high-performance and designed for high-movement. This construction adhesive sealant is free of plasticizers and more eco-friendly than other products on the market. Every AU-1 construction sealant cartridge is air vacuum filled to prevent any air pockets and handled with the utmost quality assurance.

• Industry-leading durability for a lasting seal
• 50% joint movement (± 25%) and 800% elongation 
• Straightforward application and cleanup to save time and money
• Compatibility with paint
• Interior and exterior performance
• Superior adhesion for easy and lasting application
• Prime-free application process for most substrates
• UV and mildew-resistant bead

As a fully waterproof sealant, AU-1 is an ideal choice for window and door installation products. AU-1 installation products are also compatible with many types of materials, including: 

• Concrete
• Masonry
• Glass
• Stucco
• Metal

TOWER® Sealants is the manufacturer of AU-1 and maintains an inventory of this installation sealant. No need to face uncertainty with the supply chain — AU-1 is in stock and ready to ship right now. We can offer lead times as fast as 5 days, so you can stay on schedule with your clients and deliver superior durability with your window and door caulking installations.