Interior/Exterior Water-Based Polyurethane

Product Details

Old Masters® Interior/Exterior Water-Based Polyurethane is a clear finish that creates a hard, durable coating on wooden craft projects, bird houses, painted signs, furniture, picture frames and a variety of other surfaces. This product is for use on interior and exterior surfaces. Available in Satin, Semi-Gloss and Gloss sheens.



Surface Preparation

All surfaces must be clean, dry and free from dirt, wax, grease, glue and other contaminants or penetration and adhesion will be affected.  DO NOT use over shellac, lacquer, filler, stains or sealers containing stearates.  After sanding, remove sanding dust with vacuum or damp cloth.  DO NOT use a tack rag to remove dust, as it may leave a residue that will interfere with adhesion.

Bare Wood: Sand surface thoroughly with medium grit sandpaper and progress to fine grit sandpaper. Always sand in the direction of the wood grain.  Do not use steel wool.

Previously Finished Surfaces: Surface should be sanded to remove imperfections and gloss, using extra fine sandpaper (220 grit), sanding with the grain.  Do not use steel wool.

Stained Surfaces: Stain must be thoroughly dry before applying clear finish.  Allow oil-based stain to dry a minimum of 24 hours in good drying conditions before top coating.   Do not sand uncoated stained surface.

WARNING! If you scrape, sand or remove old paint, you may release lead dust. LEAD IS TOXIC. EXPOSURE TO LEAD DUST CAN CAUSE SERIOUS ILLNESS, SUCH AS BRAIN DAMAGE, ESPECIALLY IN CHILDREN. PREGNANT WOMEN SHOULD ALSO AVOID EXPOSURE. Wear a NIOSH-approved respirator to control lead exposure. Clean up carefully with a HEPA vacuum and a wet mop. Before you start, find out how to protect yourself and your family by contacting the National Lead Information Hotline at 1-800-424-LEAD or log on to


Stir thoroughly before and during application. DO NOT SHAKE. Test the finish on an inconspicuous area to ensure adequate adhesion.  Interior/Exterior Water-Based Polyurethane appears milky in the can but dries clear.  Do not apply in direct sunlight or areas of extreme air movement.

  1. Apply with a synthetic fiber brush, foam brush, flat pad or sprayer. A short nap roller may be used for large flat areas but must be brushed immediately to alleviate air bubbles.
  2. Apply in full even coats in the direction of the grain. Do not over apply. Over applying can produce a milky appearance. Do not over brush or create excess air bubbles.
  3. Interior/Exterior Water-Based Polyurethane will dry to touch in 30 minutes and can be topcoated after 1 hour. Sand lightly between coats with fine sandpaper to produce a finer finish. If sandpaper gums up allow more dry time. Remove sanding dust.
  4. Reapply. Allow 1 to 2 hours before recoating. Three coats are recommended for minimum protection. Additional coats are recommended for wood, fiberglass and steel exposed to direct sunlight.

Do not use on decks or areas that are subject to foot traffic.

Please note: Testing is very important when applying this product over paints or stains because the appearance of these products may change when a water-based finish is applied. This product gives a soft wood amber that ONLY becomes noticeable when applied over white or pastel paints and stains.

Technical Information

Thinning: Thinning is not recommended, but if necessary, a small amount of water may be added.   For spray applications, up to one (1) pint of water per gallon may be used.

Coverage:  Approximately 230 to 470 square feet per gallon or approximately 300 to 400 square feet per gallon.  Coverage will vary significantly depending on application method and condition of wood.

Drying Time: Apply when air and surface temperatures are between 60° and 90°F and humidity is between 30% and 70%. At 50% relative humidity and 70°F, Interior/Exterior Water-based Polyurethane will dry to touch within 30 minutes and ready to topcoat after 1 hour.  Dry time will be affected by temperature, humidity and film thickness.  Protect product from freezing prior to and during application.

Wait 24 hours before subjecting surfaces to light use. Care should be used during the first week after application as the finish is still curing to its ultimate hardness.

Clean Up: Wash brushes and equipment in warm, soapy water.  Rinse clean.

MAX VOC: 275 grams/liter (2.29 lbs/gal)

Learn More

Why use clear finishes?

Clear finishes are used to seal and protect surfaces. In many cases, clear finishes offer lasting, durable protection from abrasion, marring and chipping.  Most clear finishes also protect the surfaces from damage caused by water and alcohol.  Exterior clear finishes provide protection to withstand water, weather and sunlight.  

Supplies List for Clear Finishing:

  • Fine Grade Sand Paper or Nylon Sanding Pad
  • Tack cloth or clean cloth
  • Stir Stick and Drop Cloth
  • Quality, China Bristle Brush

Safety Data Sheets