How to Apply Clear Polyurethane on a Countertop

Polyurethane is a synthetic compound used to seal wood and other materials -- it is commonly used in boat building and other construction projects. It is generally favored because it forms a nearly impermeable seal that keeps wood and other surfaces protected for years. This makes it an ideal choice for kitchen countertops, where spills, grease splatters and other accidents are common. Polyurethane wood sealers come in glossy, matte and satin finishes, so choose whichever works best with your kitchen decor.

Gloves
Goggles
Respirator
Paint stirrer
Foam or lamb's wool applicator
400-grit sandpaper

Instructions

- 1
  Open all windows in the room and put on gloves, goggles and a respirator. Polyurethane gives off very toxic fumes, so proper ventilation and precaution are paramount for your safety.
- 2
  Stir the polyurethane with a paint stirrer. Never shake the can -- this will create bubbles that may get trapped in the finish. Stir gently until any sediment at the bottom of the can is thoroughly mixed.
- 3
  Pour a small amount of the polyurethane directly onto the countertop. Spread the polyurethane in a thin, even coat with a foam or lamb's wool applicator. Completely coat the countertop with the polyurethane.
- 4
  Allow the first coat of polyurethane to dry completely. As it dries, it may bubble up or raise the grain of the wood slightly. Lightly sand the countertop with a piece of 400-grit sandpaper.
- 5
  Wipe away the dust from the sanding process with a tack cloth. Apply additional coats of polyurethane -- if the counter is going to be used heavily, apply about five coats. Lightly scuff the polyurethane with the sandpaper between each coat, except for the second-to-last coat.

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