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Gunther Extra/Build Mirror Mastic - Gallon Can

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Gunther Extra/Build Mirror Mastic - Gallon Can

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Availability: In stock.

Minimum Order Quantity: 1
For any questions or pricing call 301-779-2430.

Quick Overview

GDI Gunther Extra/Build Mirror Mastic is a high quality adhesive formulated to provide a strong, permanent bond between electro-copper-plated glass mirror and various substrates. It has been field and laboratory tested for compatibility with silver, copper and mirror paint backing. Black in color.
GDI Gunther Extra/Build Mirror Mastic is a high quality adhesive formulated to provide a strong, permanent bond between electro-copper-plated glass mirror and various substrates. It has been field and laboratory tested for compatibility with silver, copper and mirror paint backing. Black in color.

  • Builds Out to 2-1/2" (63.5 mm) Without Sag
  • Ideal for Large Mirrored Walls and Uneven Surfaces
  • Available in 10.1 Fluid Ounce Cartridges or Gallon Cans
  • Gunther Application Guidelines Available Here




  • GDI Gunther Extra/Build Mirror Mastic's viscosity provides for a build out of 2-1/2 inches (63.5 millimeters) without sag for custom mirrored walls or vanities where construction is such that there are gaps of over 3/4 inch (19 millimeters) between the mirror and the substrate.

    GDI Gunther Extra/Build at 72 degrees Fahrenheit (22 degrees Celsius) achieves approximately 20 percent strength in 48 hours, full cure up to 300 psi in 30 days. Easy working consistency year round. Will adhere to a wide variety of substrates including drywall, wood, metal, glass, marble and tile. All porous substrates should always be sealed with an acrylic sealer like Gunther Prime-N-Seal Primer . GDI Gunther Extra/Build should be applied in four to five inch (102 to 127 millimeter) diameter patties with a height that will allow it to spread out to five to six inches (127 to 152 millimeters) when compressed.

    Note: Not for use on acrylic mirror, vinyl backed safety film, plastics or styrofoam. Do not apply to wall paper or paint. Not designed to be exposed to continuous U.V. light. Mechanical support systems are recommended for all mirror applications. This includes the use of mechanical fasteners at the top of the mirror.
    SKU GN201B
    Case Qty 4

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