A polyurethane roof coating finish is a super-tough varnish that protects your wood from scratches, water damage and other harm. You can choose from both oil-based and water-based varieties, each offering its own set of pros and cons. Compared to traditional varnishes, like shellac, polyurethane is more durable and water resistant. It also dries quickly and can be applied using various methods, including wiping, brushing or spraying.
Unlike stain, which highlights natural wood grain, polyurethane offers long-term protection and helps keep the material looking beautiful. It is available in a variety of sheens, from matte to satin to semi-gloss. The sheen you choose should be based on how natural or shiny you want the material to look.
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Water-based polyurethane dries crystal clear, cleans up with soap and water, and emits less VOCs than its oil based counterpart. However, it can react with the wood’s grain, meaning you may need to apply more coats to achieve a smooth surface. It also tends to yellow more over time, so if you’re going for an unclouded look, this isn’t the product for you.
While you can use a brush or spray to apply the finish, most people prefer to wipe it on with a lint-free cloth or sponge. Start by dampening the cloth or sponge with a small amount of the finish, then rub it onto the wood working section by section to get even coverage. It’s important to allow the polyurethane enough time to dry between each application, typically 2 hours for water based products and 3-6 for oil based.