Preparation is the foundation of a successful recoat. Start by removing all dust and residue; any contamination can prevent the new finish from adhering properly, leading to peeling or 'fish eyes.' After cleaning, use a fine-grit screen (typically 120-150 grit) to lightly abrade the surface. This does not remove the finish but dulls it, creating microscopic scratches that the new polyurethane can grip. Finally, vacuum and tack the floor to ensure no dust remains before application.
Ask an ExpertHardwood
How do I prepare a floor for a new polyurethane coat?
Prepare the floor for a new polyurethane coat by thoroughly cleaning with a professional-grade wood floor cleaner to remove all oils and debris. Then, lightly abrade the surface using a floor buffer or sander to create a profile that allows the new finish to bond.