C.R. Laurence Co., Inc.
Connecting the World to Everything Glass
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Catalog Number: GN201B

  • Available in Two High Strength Formulas
  • Builds Out to 2-1/2" (64 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

  • CRL Gunther Ultra/Bond® and Extra/Build® Mirror Mastics are high quality adhesives formulated to provide a strong, permanent bond between electro-copper-plated glass mirror and various substrates. Both have been field tested for compatibility with silver, copper, and mirror backing. Both have an easy working consistency year round, and will adhere to a wide variety of substrates including drywall, wood, metal, glass, marble, and tile.

    CRL Gunther Extra/Build® Mirror Mastic - Gallon Can


    Other Products/Finishes:

    GN200A CRL Gunther Extra/Build® Mirror Mastic - Cartridge
    GN201B CRL Gunther Extra/Build® Mirror Mastic - Gallon Can

    Catalog Number:GN201B
    Also Available in These Catalogs:
    CRL53R Glass & Glazing Catalog, PAGE 104G
    CRL23R Frameless Shower Door and Mirror Hardware, PAGE 476J
    CRL03 Sealants, Adhesives, and Fasteners, PAGE N274
    Contents:1 gl (3.785 l)
    Ship Via:Hazardous Material - No Air Shipments
    Shipping Weight:9 lb (4.08kg)
    Case Qty:4
    Minimum Order:1 Gallon

    NOTE: Not for use on acrylic mirror. Use Cat. No. GN8 Gunther Prime-N-Seal Primer on all porous substrates. Application guidelines are available online for all Gunther products. Mechanical support systems are recommended for all mirror applications.

    Gunther Extra/Build®’s viscosity provides for a build out of 2-1/2" (64 mm) without sag for custom mirrored walls or vanities, where construction is such that there are gaps of over 3/4" (19 mm) between the mirror and the substrate. At 72°F (22°C) it achieves approximately 20% strength in 48 hours, full cure up to 300 psi in 30 days. It comes in 10.1 Fl. Oz. cartridges and one gallon cans.

    CRL gives no warranty, express or implied on any mirror mastic. It is the user's responsibility to determine the mastic's suitability to different types of mirror backing and each specific installation.

    Most shipping weights are approximate and have not been verified. If the exact weight is needed in order to determine shipping costs, and shipping costs are required in order for you to complete your order, please request this prior to submitting your order by contacting CRL Customer Service. Product images shown are of the actual product or a close representation. ColorsColours can vary depending on your computer's video card and on how your monitor's colorcolour is adjusted.