How to Dry Spar Urethane

Apply spar urethane to protect a variety of wood surfaces.

Spar Urethane is a water resistant, clear finish that is designed for use on wood. Used both indoors and out, spar urethane provides an ultraviolet protective finish on wood to prevent the wood from losing color due to the sun's damaging rays. The urethane is applied to unfinished or finished wood and its flexibility allows for the natural expansion of the wood due to changes in temperature and moisture content. Apply spar urethane following a few steps.

Things You'll Need

• Dust mask
• Natural fiber brush
• 220 grit sandpaper
• Tack cloth

Instructions

1. Finish the wood surface with stain, following the stain manufacturer's directions. Allow for sufficient drying time as directed, or leave the surface natural if desired.

2. Put on a face mask for protection. Apply a coat of spar urethane to the wood surface with a natural fiber brush, following the grain of the wood. Apply sufficient spar urethane to coat the grain ends of wood and joints.

3. Allow the urethane to dry for four hours. Sand the finished surface with 220 grit sandpaper. Sand with the grain, not against it. Wipe the surface with a tack cloth to remove dust.

4. Apply a second coat of spar urethane to the wood surface. Apply the finish with the wood grain and allow four hours drying time.

5. Sand the surface with 220 grit sandpaper if applying a third coat. If applying only two coats, allow 24 hours for the finish to dry and cure before handling or using.

References

• Min Wax: Helmsman Spar Urethane