Do not use any product containing water. Refinishing existing flooring generally does not require a preliminary sanding but, rather, a thorough cleaning and another coat of wax, without leaving any evidence of wax overlap in heavy traffic areas. As the patina sheen wears away, a reapplication of wax will restore it. Surface sealers , on the other hand, do not penetrate the wood-wearing surface. Instead, they create a wood-bonding surface layer.
Polyurethanes are the more popular surface sealers.
They provide both durability and moisture resistance. Polyurethane sealers offer excellent resistance to water, scuff marks and scratches, and provide a durable finish for high-traffic areas such as hallways, kitchens, bathrooms and family rooms. When regular maintenance no longer provides satisfactory floor surface appearance, sanding is recommended before applying a new coat. Moisture-cure urethanes are the hardest of the surface sealers. These urethane sealers are extremely prone to errors.