If the floor is in good condition, you can improve its appearance and provide a durable, non-porous surface by applying a polyurethane sealer. Wash the floor thoroughly with household detergent and water to remove dust and grease, then rinse with clean water and leave the floor to dry. To remove polish and stubborn stains, you can use white spirit; but afterwards always wash with detergent and rinse with clean water to ensure there are no traces of spirit left on the floor.
If the floor is painted, you should hire a floor sanding machine and use it to strip the paint back to bare wood; then wash and rinse the floor as before. Apply the sealer, following the manufacturer’s instructions, and leave each coat to dry before applying the next (three coats should be sufficient); on the penultimate coat, use abrasive paper or wire wool to give a perfectly smooth surface for the final coat.
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