Undermnount Fastener Instructions

Using GW 4300 All Purpose Structural Adhesives
when Bonding Undermount Fasteners

When properly applied, GW 4300 All Purpose Structural Adhesive provides impact resistant bonds to Natural Stone, Quartz and Solid Surfaces

The following instructions will help ensure that you achieve the highest possible bond strength and performance when using GW 4300 All Purpose Structural Adhesive to fasten a bolt in an undermount application.

Natural Stone-Area Preparation

It is critical that the area for bonding be free of moisture and any remaining slurry left from the quarrying process. For Natural Stone applications, a diamond cup wheel can be used to grind the area that you are going to bond to. It is not enough to simply wipe away dust with alcohol or acetone. To remove moisture, a weed burner, torch or heat gun may be used on porous stones. A final wipe with acetone or denatured alcohol will ensure a clean surface and the best performance.

Solid Surface, Quartz and Composites-Area Preparation

The area for bonding must be free of moisture and any other contamination. To increase adhesion, scuff the area with a medium grit paper before cleaning with acetone or denatured alcohol. Always ensure that the area is clean before proceeding.



Step by Step- Cartridges (w/ Mixing Tip)

  1. Once the area has been properly prepped and is free of contaminants, dust, moisture etc. Wipe clean with acetone or denatured alcohol and let dry completely. For Natural stone, grinding with diamonds will greatly increase the bond strength.
  2. Mark the placement of the bonding fastener with a pencil or marker


  3. Place the 400ml or 50ml cartridge in the appropriate dispensing gun, purge a small amount of glue into a disposable container and then attach the mixing nozzle.
  4. Apply approximately 5-10mls of glue to the area outlined ensuring that you completely cover your marks. There should be enough glue to allow significant flow up through the holes in the base plate of the fastener while gently pushing it into the glue.

  5. You can further increase bond strength by smoothing over the glue, fully encapsulating the base plate. Allow to cure 15-20 minutes before applying any force.


Step by Step-50ml and Plunger( No Mixing Tip)

  1. Once the area has been properly prepped and is free of contaminants, dust, moisture etc. Wipe clean with acetone or denatured alcohol and let dry completely. For Natural stone, grinding with diamonds will greatly increase the bond strength.
  2. Mark the placement of the bonding fastener with a pencil or marker
  3. Remove the cap from the 50ml cartridge and use the plunger to displace roughly half of the cartridge into a disposable cup. This should provide enough glue to bond approximately 4 clips.

  4. Using a popsicle stick, stir the glue for 20-30 seconds to ensure a good mix of the two components.
  5. Apply approximately 5-10mls of glue to the area outlined ensuring that you completely cover your marks. There should be enough glue to allow significant flow up through the holes in the base plate of the fastener while gently pushing it into the glue.


  6. You can further increase bond strength by smoothing over the glue, fully encapsulating the base plate. Allow to cure 15-20 minutes before applying any force.
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