- Sand the edges of your cabinets or other base for your countertop with fine-grit sandpaper. Make sure that all of the edges are level and not rough. Wipe down the base thoroughly with a damp cloth to remove dust and debris.
- Squeeze a narrow bead of silicone adhesive or glue onto each edge of the base cabinets or other stand for your countertop.
- Lift the new countertop. Hold it approximately 2 inches above the base and position it correctly.
- Lower the new countertop gently onto the base on top of the glue. Install a pressure clamp at each corner of the countertop if it is made from a lightweight material to hold it securely to the base.
- Wipe away any excess adhesive that escapes from the seams beneath the countertop, using a damp cloth. Allow the adhesive to dry for 24 hours. Remove the clamps, if used.
- Sand the edges of the countertop base with fine-grit paper if needed to make them even and smooth.
- Wipe the edges of the base with a damp cloth, if necessary.
- Lift the new countertop and lay it into place atop the base. Position it correctly. Have someone hold it in place, if needed.
- Sit on the floor and look up at the underside of the countertop. Find where the edges of the base meet the countertop and provide a good surface for screws.
- Drill a screw every 4 to 5 inches along each edge of the base into the countertop, using a drill fitted with a screw bit. Use 1- or 2-inch screws, depending on the thickness of your countertop.