Polyurethane plywood is used by industrial manufacturers and carpenters to give a shiny new finish to their wood products, but it’s also a great DIY choice for refinishing an old table or adding protective coats to your hardwood floors. It’s tough, long-lasting and can withstand heavy wear and tear. Whether you choose water or oil-based polyurethane, the key to a successful application is to follow the product’s instructions closely. If you’re using an oil-based product, be sure to use a respirator in a well-ventilated area and apply with a natural-bristle brush or rag. It can take up to 6 hours for oil-based polyurethane to dry fully in good conditions.Source :https://polyurethaneroofcoating.co.uk

A polyurethane finish offers more protection for wood than lacquers or varnishes because it contains synthetic resins. It’s available in a wide variety of sheens and can be applied to stained or unfinished wood. It’s often recommended as a final coat over stain because it helps to protect the wood fibers from scratches and moisture.

Weatherproofing Plywood: The Role of Polyurethane Sealants

If you want a clear finish that won’t yellow over time, go for an oil-based polyurethane. However, it takes a longer time to dry completely, and you’ll need to apply more coats than with a water-based one.

You’ll find that water-based polyurethane can react with the grain of wood, so you may need to apply more coats than with an oil-based one. In addition, it tends to be more prone to “sheeting,” or flaking, after the first couple of layers.