How to Apply a Polyurethane Finish to a Table

As a sealer, polyurethane is used in many industries, including boat building, construction and woodworking, because it is durable, long-lasting and forms a strong seal over most surfaces. Polyurethane is also used in making plastics and different types of foam for mattresses, pillows and padded furniture. Although it is a commonly used material, it is extremely toxic and should be handled with the utmost caution. Once you have stained or painted your wood table, you can add a polyurethane topcoat to keep it protected from spills and minor damage.

Polyurethane
Foam or lamb's wool applicator
400-grit sandpaper

Instructions

- 1
  Stir the polyurethane gently with a paint stirrer. When transporting the can, try not to agitate its contents. Do not shake the can to mix the polyurethane. This can cause bubbles to form in the liquid, which can be transferred to your finish.
- 2
  Pour a small amount of the polyurethane directly onto the table. Spread the polyurethane over the surface of the wood with a foam or lamb's wool applicator. Allow the polyurethane to dry completely.
- 3
  Buff the surface of the dried polyurethane with a piece of 400-grit sandpaper. This will help the next coat adhere to the surface of the previous coat. Wipe away the dust with a damp cloth.
- 4
  Apply a second coat of polyurethane to the table using the same process you used earlier. Allow the polyurethane to dry. Apply as many as five coats of polyurethane, allowing each coat to dry before applying the subsequent one.

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