Varathane Water Based Spar Urethane for Outdoor Wood
Varathane Water Based Spar Urethane features a clear, non-yellowing finish that resists scratches and stays beautiful over time. It is manufactured to provide protection from UV light and weather. It is ideal to use for all kinds of outdoors wooden projects including outdoor furniture, doors, windows, fences, railings, house trim, and boats (above the water line).
Features of Water Based Spar Urethane
Powerful UV absorbers protect wood from sun damage.
Extra-fast drying, apply up to 3 coats/day.
Low odor and fast, easy soap-and-water clean-up.
Increase the life of exterior wood.
NOTE: At least 4 coats are suggested for best result.
How to Apply Varathane Water Based Spar Urethane?
Previously Finished Surfaces - To ensure proper adhesion, surfaces must be clean, dry and free of wax, grease, oil, shellac, lacquer, mildew and polishes. Remove wax with a wax stripper, shellac with a paint stripper, and mildew with a solution of up to 10% household bleach and water. Old finishes in poor condition must be removed by sanding using 120-150 grit sandpaper. Sand to obtain a smooth surface. Do not use steel wool as rust may develop after the finish is applied. Remove all sanding dust using a vacuum or cloth dampened with mineral spirits.
Unfinished Surface Preparation - Sand smooth using 120–150 grit sandpaper and remove all sanding dust with a vacuum or cloth dampened with mineral spirits. If a filler or putty is used, make sure that it does not contain wax and allow enough time for it to dry thoroughly.
Stained Or Painted Wood - Follow manufacturer’s directions for application of stain or paint. Make certain the surface is thoroughly dry before applying Varathane Outdoor Water Based Spar Urethane. For best results, use Varathane Premium Wood Stains.
Testing Color - Test Varathane Outdoor Water Based Spar Urethane in an inconspicuous area before beginning. Testing is particularly important when applying over paints or stains as the appearance of these products may change slightly when a water-based finish is applied.
Product appears milky when wet but dries to a crystal clear finish. Do not apply in direct sunlight. Use adequate ventilation at all times. Apply only when air (ambient) temperature is between 55-90°F (13-32°C) and the relative humidity is below 85%. Be careful when applying over white or pastel paints or stains as discoloration may occur. To prevent bubbles in the finish, DO NOT SHAKE, do not overbrush or apply with a roller.
Brush Application - Stir thoroughly before and during use. DO NOT SHAKE. Shaking will create bubbles in the finish. Apply using a good quality, synthetic bristle brush, foam brush, or applicator. Allow the finish to dry a minimum of 2 hours before re-coating. Lower temperatures and/or higher humidity may cause slower dry times. Re-coat only when previous coats have dried clear and feel hard (no longer tacky to touch). A powder should develop when lightly sanded. If any coat has dried more than 12 hours, lightly sand before re-coating to avoid brush marks. A minimum of 4 coats are recommended. Allow finish to dry 24 hours before light use. Wait 3 days before subjecting surface to normal usage. Clean application tools and equipment with soap and water. Dispose of properly. For disposal guidance of unused amounts, contact your local or state government environmental control agency
Properties of Varathane Spar Urethane for Outdoor - Water Based
Acrylic Modified Urethane
Glycol Ethers, Water
946 ml and 3.78 Ltr
Volatile Organic Compounds
<275 g/l (2.30 lbs./gal.)
Recommended Dry Film Thickness (DFT) Per Coat
1.0-1.5 mils (25-37.5µ)
Wet Film to Achieve DFT (unthinned material)
4.0-6.0 mils (100-150µ)
Theoretical Coverage at 1 mil DFT (25µ)
394-410 sq.ft./gal (9.7-10.0 m2/l)
Practical Coverage at Recommended DFT (assumes 15% material loss)
225-350 sq.ft./gal (5.5-8.6 m2/l)
Dry Times at 70-80°F (21-27°C) and 50% RH
30 minutes to touch. 24 hours
to Light Use . 2 hours