Glaze Gunther Ultra Bond Mastic is a professional-grade adhesive formulated for general-purpose mirror installation. Designed to bond securely to a variety of substrates, it builds out from 1/32" to 3/4", making it ideal for both standard and uneven surfaces. This mastic reaches 30% of its maximum strength within 24 hours and cures completely in 28 days, offering a strong, reliable hold. Available in economical gallon pails and convenient cartridges, it provides flexibility for jobs of any size. For best results, GLAZE recommends using mechanical fasteners alongside mastic to ensure long-term stability and safety.