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Interior Clear Protective Finishes

Minwax® High-Build Polyurethane

Minwax® High-Build Polyurethane

Minwax® High Build Polyurethane is a clear, oil-based, durable protective finish that is specially formulated to provide long-lasting beauty and protection with just two coats.


Product Details

Sheens: Gloss, Semi-Gloss, Satin
Application Tool: natural bristle or foam brush
Location: interior wood surfaces
Recoat: after 4-6 hours
Dry time: 24 hours
Cleanup: mineral spirits or paint thinner
Coverage: 400 - 500 sq. ft. per gallon
Coats: 2
VOC Content: maximum VOC of 350 g/L
Recommended Uses: woodwork, furniture, cabinets, doors and floors.
Availability: not available in California

FAQ

Q. Where can I use High-Build Polyurethane?

High-Build Polyurethane is ideal for use on all interior bare or stained wood surfaces. It can be applied over oil-based stains like Minwax® Wood Finish™ or Minwax® Gel Stain. It can also be applied over Minwax® Water Based Wood Stain wood tones, provided the stain has dried completely.

Q. How many coats do I need apply?

Only two coats are required for maximum durability. Additional coats are not recommended.

Q. Can I mix High-Build Polyurethane with Fast-Drying Polyurethane?

Yes. The two products are compatible. Follow the directions for High-Build Polyurethane for application, dry times and number of coats. As with all clear finishes, if you plan on mixing, be sure to mix everything before you start to ensure an even appearance across the surface of the wood.

Q. Can I apply Fast-Drying Polyurethane over High-Build Polyurethane or vice versa?

The two products can be applied over each other as long as the first has fully cured. Follow the directions for the product you are using. Do not exceed two coats in total. Do not finish part of a surface with one topcoat and part with the other as this could result in uneven appearance across the surface of the wood.

Q. What is the V.O.C. level of High-Build Polyurethane?

High-Build Polyurethane has a maximum V.O.C. of 350 g/L.

Directions

WARNING! Removal of old paint by sanding, scraping or other means may generate dust or fumes that contain lead. Exposure to lead dust or fumes may cause brain damage or other adverse health effects, especially in children or pregnant women. Controlling exposure to lead or other hazardous substances requires the use of proper protective equipment such as a properly fitted respirator (NIOSH approved) and proper containment and cleanup. For more information, call the National Lead Information Center at 1-800-424-LEAD (in US) or contact your local health authority.

DIRECTIONS:

For project application:

  1. Surface must be dry and free of paint, wax, grease, polish, dirt, old finishes in poor condition or other foreign matter.
  2. Sand to obtain a smooth, uniform surface. Remove all dust and wipe with a cloth dampened with mineral spirits.
  3. If desired, apply stain, such as Minwax® Wood Finish™ or Minwax® Gel Stain to bare wood following all label directions. Wait 8 hours before applying Minwax® High-Build Polyurethane over stain.
  4. Stir High-Build Polyurethane before use to eliminate settling on the bottom of the can. DO NOT SHAKE.
  5. Apply a THIN coat of High-Build Polyurethane using a high quality natural bristle or foam brush. Let dry at least 4-6 hours.
  6. Lightly sand entire surface with 220-grit sandpaper. Remove all dust and wipe with a cloth dampened with mineral spirits.
  7. Apply a second coat following directions in Steps 4 & 5.
  8. Only two coats are required to achieve optimal film build and durability. If a third coat is desired, wait at least 12 hours and repeat Steps 6 & 7.
  9. Allow 24 hours before light use.

For floor Application:
For new, stripped or unfinished floors

  1. Surface must be dry and free of paint, wax, grease, polish, dirt, old finishes in poor condition or other foreign matter.
  2. Sand using 100-grit sandpaper to obtain a smooth, uniform surface. If floor is not going to be stained, sand again using 120-grit. After each sanding, remove all dust and wipe floor with a cloth dampened with mineral spirits.
  3. If desired, apply Minwax® Wood Finish™ or Minwax® Professional Formula Sanding Sealer to bare wood following all label directions. Wait 8 hours before applying Minwax® High-Build Polyurethane over Minwax® Wood Finish™ and 2 hours over Minwax® Professional Formula Sanding Sealer.
  4. Stir High-Build Polyurethane before use to eliminate settling on the bottom of the can. DO NOT SHAKE.
  5. Apply a thin coat using a lambswool or synthetic pad applicator. Maintain a wet edge to avoid lap marks. Ensure that the surface is evenly and entirely covered.
  6. Wait 12-18 hours before sanding. Low temperature or high humidity will extend dry time. Check the surface to ensure it is not tacky to the touch before sanding.
  7. For best results, use an orbital floor buffer with a maroon buffing pad specifically designed for sanding between coats. Do not use a belt or drum-type sander for sanding between coats. If sanding produces tacky or gummy residue, stop sanding immediately and wait until surface is no longer tacky to the touch. Remove all dust and wipe floor with a cloth dampened with mineral spirits.
    Note: Sanding residue should be dry and powdery. If sanding residue is gummy or sandpaper, screen or pad clogs, stop sanding and allow additional dry time. Remove all sanding residue and follow precautions for safe disposal located on the cautionary panel. Accumulated sanding residue may spontaneously catch fire if not immediately disposed of in a sealed, water-filled metal container. Over-application, low temperature and high-humidity will increase cure time and may increase the risk of spontaneous combustion of the sanding residue.
  8. Apply second coat following directions in Steps 4 & 5.
  9. Only 2 coats are necessary to achieve optimal film build and durability. A third coat is NOT recommended. If a third coat is applied, wait at least 3-4 full days after the second coat. Sand and apply third coat following directions above.

To Sand and Recoat a Floor

  1. Sand floor using 120-grit sandpaper. Remove all dust and wipe with a cloth dampened with mineral spirits.
  2. Apply a thin coat using a lambswool or synthetic pad applicator. Maintain a wet edge to avoid lap marks. Ensure that the surface is evenly and entirely covered.
  3. Only 1 coat is necessary to achieve optimal film build and durability. A second coat is NOT recommended. If a second coat is applied, wait at least 3-4 full days after first coat then sand and apply the finish following Steps 7 & 8 under “For new, stripped or unfinished floors” section.

Floors will accommodate light foot traffic 18-24 hours after the final coat. Avoid heavy traffic and wait to replace furniture for at least 72 hours after the final coat. When replacing furniture, do not slide. Do not clean floors or replace rugs for seven days.

Clean Up: For easy clean-up use mineral spirits or paint thinner.

Coverage: Approximately 400-500 square feet per gallon.

Note: Dry times are based on good ventilation, temperature of 77°F and 50% relative humidity. Lower temperature, higher humidity, lack of ventilation or application of thick coats will extend dry time. Slight ambering may be experienced when polyurethane is applied over light-colored wood surfaces. Always spot test on an inconspicuous area to ensure satisfactory results. For light-colored wood surfaces, we recommend protecting with Minwax® Polycrylic® Protective Finish.

NOTE: The product may appear slightly purple in the can, but it dries clear.