Good ventilation is crucial. Crack a window to let fresh air in. If you’re working in a small space, you may want to prop an exhaust fan in the window. Face the fan out to pull vapors from the room and blow them outside. [2] X Research source Never work in a damp area, as this will mess with your finish. [3] X Expert Source William & Shannon LatilFurniture Refinishing & Home Remodeling Specialists Expert Interview. 29 October 2021.

If you’re working on a very large project, you may want to use an electric sander or sanding block to get the job done. You can use sanding sponges for corners and complex areas where a power sander cannot reach. [5] X Research source [6] X Expert Source Sarah FogleDIY Specialist Expert Interview. 10 August 2021. Wear protective gear if you use power tools. [7] X Research source [8] X Expert Source Sarah FogleDIY Specialist Expert Interview. 10 August 2021.

The smoother the surface, the better your clear coat will adhere and look.

Foam brushes are recommended because they are inexpensive, and you can toss them out when you’re done. Natural bristle brushes are also a great choice, although they are more expensive and not disposable.

Creating a homemade sealer is the easiest and most economical choice.

Watch for dripping. If you notice any drips, brush over them to smooth them out.

Leave this to cure for 12-24 hours.

Always apply the finish as evenly as possible. [17] X Expert Source William & Shannon LatilFurniture Refinishing & Home Remodeling Specialists Expert Interview. 29 October 2021. When bubbles occur, brush back over the finish lightly to cause them to pop. [18] X Research source You can also use a spray-on finish instead of brushing it on. [19] X Expert Source William & Shannon LatilFurniture Refinishing & Home Remodeling Specialists Expert Interview. 29 October 2021.

Watch for any drips and smooth them out with your brush as they occur.

Make sure the surface is fully dry to the touch before proceeding.

If you don’t have a tack rag, you can use a moistened lint-free cloth or a vacuum cleaner.

Always stretch the polyurethane as thin as you can. Let the surface cure for 24 hours.