To apply new laminate over old laminate countertops, you typically prepare the existing surface thoroughly before cutting and adhering the new laminate sheets.
Applying new laminate directly over existing laminate is a viable method for updating countertops without the extensive process of removing the old material entirely. This approach requires careful preparation of the existing surface to ensure proper adhesion and a smooth, durable finish.
Key Steps for Laminating Over Old Laminate
Based on standard practices and the provided reference, the process involves several critical stages:
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Prepare the Substrate: The existing laminate surface must be prepared to accept the new adhesive.
- Scratch and scuff the surface: This creates a profile for the adhesive to grip onto. Use sandpaper (like 80-grit) to thoroughly rough up the entire surface of the old laminate countertop.
- Clean the surface: After scuffing, remove all dust and debris. A vacuum followed by a wipe-down with a damp cloth is usually effective. Ensure the surface is completely dry before proceeding.
- Fill imperfections: Address any damage on the old surface. Fill any cracks and broken areas with Bondo or another suitable epoxy filler. Sand these areas smooth once cured.
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Measure and Cut New Laminate:
- Precisely measure the dimensions needed for your new laminate pieces, including edges and the main top surface.
- Cut, scribe and trim new laminate pieces: Cut the new laminate slightly oversized (about 1/2 inch) to allow for final trimming.
- Cut the new sink hole: The reference specifies doing this before prepping the countertop and before installing the new laminate. This allows for easier handling of the laminate sheet and ensures the hole is correctly placed.
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Apply Adhesive:
- Contact cement is the typical adhesive used for laminate. It is applied to both the back of the new laminate sheet and the prepared surface of the old countertop.
- Allow the adhesive on both surfaces to dry to the touch according to the manufacturer's instructions (usually 15-30 minutes).
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Install the New Laminate:
- Install the edges first: This is a common practice that provides a clean seam where the top piece meets the edge. Apply adhesive, allow it to dry, and carefully place the edge pieces. Use a roller to ensure good contact and adhesion.
- Install the top sheet: With the adhesive dry on both surfaces, carefully position the oversized laminate piece over the countertop. Using dowels or strips of wood placed on the countertop can help prevent premature contact, allowing you to align the sheet perfectly before removing the dowels and pressing the laminate down.
- Roll the surface: Use a J-roller or laminate roller to apply firm pressure across the entire surface to ensure a strong bond and eliminate air bubbles. Work from the center outwards.
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Trim the Excess:
- Once the laminate is firmly bonded, use a router with a specialized laminate trimming bit to cut away the excess material.
- Choose the right router blade to trim the laminate: A flush trim bit or a bevel trim bit is typically used. Ensure the bit is sharp to prevent chipping. Trim both the edges and the top sheet where it meets obstacles or walls.
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Finishing:
- Clean the surface and install the sink back into the newly cut hole.
- Apply caulk around the sink and backsplash if needed.
This process, while simpler than full countertop replacement, still requires precision and attention to detail for a professional result.
Overview Table
| Step | Action | Notes |
|---|---|---|
| Preparation | Scratch/Scuff Old Laminate | Creates adhesion profile |
| Fill Cracks & Damage | Use Bondo or epoxy filler | |
| Clean Surface | Remove dust and debris | |
| Cutting | Cut New Sink Hole | Do this before prepping and installing |
| Cut New Laminate Pieces | Cut slightly oversized; scribe/trim as needed | |
| Installation | Apply Contact Cement | To both surfaces; let dry to touch |
| Install Edges | Edges first for a clean seam | |
| Install Top Sheet | Use dowels for positioning; roll firmly | |
| Trimming | Trim Excess Laminate | Use a router |
| Choose Router Blade | Select the right blade (flush trim, bevel trim) | |
| Finishing | Clean & Reinstall Sink | Seal edges |
Source: Adapted from Addicted 2 Decorating
This method provides an updated look for your countertops without the complexity and cost of a complete removal and replacement.
