Gunther Extra Build Mastic – 1 Gallon (Black)

Product Description

Gunther Extra Build Mastic is a high-performance mirror adhesive engineered for applications that require extra build-out and dependable strength. With the ability to build out up to 2-1/2″, it is ideal for uneven surfaces, large gaps, and demanding installations in both residential and commercial environments.

This versatile mastic bonds securely to a wide range of substrates and delivers 25% strength within 24 hours, reaching full cure in 30 days for long-lasting, reliable performance. Available in easy-to-use cartridges and economical gallon pails, Gunther Extra Build provides installers with flexibility, efficiency, and professional-grade results.

For added security, GLAZE recommends using mechanical fasteners in conjunction with any mastic installation.

Features & Specifications

• High-performance mirror mastic for extra build-out applications

• Allows build-out up to 2-1/2″

• Bonds to a wide variety of substrates

• Achieves 25% strength in 24 hours

• Reaches 100% cure in 30 days

• Available in cartridges and gallon pails

• Suitable for residential and commercial projects

• Mechanical fasteners recommended for optimal stability

• Case quantity: 4 gallons