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The laminate finish will adhere best to the floor if it's clean. Sweep and mop the floor thoroughly, paying attention to corners and any visible dust or debris. Before you stain the floor, inspect it for any chips, cracks, or dents. Depending on the extent of the damage, fill minor damage with laminate floor patching material or replace excessively damaged planks. You can buy laminate floor patching material from most home improvement stores. Fill the entire dent, crack, or chip with the floor patching material using a putty knife and let it dry for at least 24 hours. with 220-grit sandpaper. Using light pressure, hold 220-grit sandpaper over the floor's surface. Rub the sandpaper across the surface in a circular motion, smoothing out any small bumps or imperfections.  Finishes and paints adhere better to laminate floors with a smooth, sanded surface.  To speed up the sanding process, you can use a sanding block or orbital sander instead. After sanding the floor, use a damp washcloth to remove any dust left behind by the sandpaper. Use a dry washcloth to absorb excess water on the floor before applying any stains. Do not stain the laminate floor until it is completely dry.
Wash the floor thoroughly before staining it. Repair any dents, cracks, or chips in the laminate flooring. Sand the floor Wipe away any residual sandpaper dust.