Materials Required

• 100% Clear Silicone Sealant/Adhesive (bathroom-grade)

• X-acto knife or small chisel (for removing old adhesive)

• 2x4 wooden pieces with wood shims (to support basin during curing)

• Rubbing alcohol and clean cloth

Step-by-Step Instructions

1. Prepare the Area

• Carefully remove old adhesive or silicone from the underside of the countertop and the lip of the sink basin using an X-acto knife or chisel.

• Wipe all bonding surfaces clean with rubbing alcohol to remove dust, grease, or residue.

2. Apply Silicone

• Apply a continuous bead of 100% silicone around the edge of the sink basin where it will contact the underside of the countertop.

3. Position the Basin

• Lift the sink basin into place under the countertop.

• Support it securely by placing 2x4 wooden braces beneath the basin and tightening them with shims to hold it firmly in position.

• Ensure the basin is flush and properly aligned.

4. Curing Time

• Leave the basin supported and undisturbed for at least 24–48 hours to allow the silicone to fully cure.

• Once cured, remove the braces and shims carefully.
  

Tip: Do not use the sink until the silicone has fully cured to prevent shifting or leaks.