Polyurethane minwax

Polyurethane minwax DEFAULT

It used to be that varnish was the go-to finish for woods.  Long ago, varnishes were made by mixing a resin such as pine sap with a solvent such as mineral turpentine or spirits and brushed on a wood surface.  The result was and continues to be the golden hue and hard surface we associate with the use of varnishes.

The history of varnish extends back millennia.  Ancient Egyptians used it as a finish for wood constructs. It shows up in Asian history centuries later and in the custom of lacquering (a variation of varnish) furniture.  During the Tang Dynasty (618 – 907 CE), varnishes were even applied to clothes and weapons.

Polyurethane was invented in the 1930s with numerous applications, among which was and continues to be wood finishes.  Shoe soles, mattresses, and foam insulation are other of its uses.  It’s non-toxic and does not present health concerns, and with multiple applications, creates a hard protective surface on woods, replacing varnish as today’s go-to finish.

Table of Contents

How To Apply Polyurethane Finishes on Your Wood Projects

Polyurethanes can be both oil-based and water-based. Which one you will choose to use depends on your desired outcome:

  • Oil-based Polyurethane tends to look better in color and shine on hardwoods and is a good choice for floors.  However, it can tend to yellow over time, requiring a refinish.
  • Water-based Polyurethane is clear and tends not to yellow.  It is a good choice if you want the natural quality of your wood to be maintained.

Neither makes wood waterproof, although they both do make wood water resistant.  Its seal of the wood by polyurethane does offer protection and acts as a repellent against water absorption.  It also protects wood from scratches, and in the case of water-based polyurethanes, maintains its color so that the natural qualities of the wood are protected.

After you have chosen which polyurethane to use for your furniture, cabinet doors, window trim, floors, etc., its application is basic and straightforward.  A high-quality natural or foam brush should be used, and a thin coat applied.  Minwax Fast-Drying Polyurethane is a good brand choice, and the following discussion is specifically about Minwax.

  • After a 4-6 hour dry time, you’ll want to sand the entire coat with a fine 220 grit lightly.  Be sure to remove all dust with a thorough cleaning before the next coat is applied.  This will create an even finish.
  • It’s not fatal if you don’t sand between coats, though.  The effect of not doing so is not a significant factor in the overall appearance of the wood.  But, if you’ve built it carefully and correctly, paying attention to detail in your woodworking, why not go the extra step.
  • If the piece being finished will experience no use (window or door trim, for instance, as opposed to a table or hardwood floor), two coats may very well be sufficient. 
  • If the finished piece is going to be used, whether hard or soft (think a chair, a table, or a floor), go the extra step and add a third coat, again sanding between applications and allowing 4-6 hours of drying time for each coat.

Environmental Conditions Affecting Polyurethane

A dry and low humidity environment will facilitate a quicker dry time than high humidity.  The 4-6 hour dry time range speaks to this, with low humidity conditions contributing to the lower end of the range, and higher humidity increasing dry time.

Be patient between coats.  The dry time between applications needs to pass.   Remember that you will be sanding in between coats, and you want the coat to be sufficiently dry before you touch it with sandpaper.

Drying Time vs. Cure Time For Polyurethane

Minwax Spray Polyurethane

There is a difference between drying time between coats and full drying time before use.  Allow a full 24 hours for drying before light use (again, think furniture like a chair or a table or a floor).

There is also a difference between drying time and curing time.  Allowing a complete curing process to play out will help create a hard surface and allow a strong adhesion of the finish to the wood surface.

A full cure time for Minwax Fast Drying polyurethane is about a month.  If you can still smell the polyurethane, it’s still curing.  Show patience while you wait for the odor to dissipate fully before hard use.

You’ve measured twice and cut once; you’ve taken great care in making that piece of furniture, or those cabinets, or the new floor.  Your project has turned out well and just as you planned. 

So give it that finishing touch (pun intended) with a well and patiently applied polyurethane finish.  Do it right, follow these steps, let it cure, and enjoy the results for many years to come.

Sours: https://www.obsessedwoodworking.com/how-long-does-it-take-for-minwax-polyurethane-to-dry/

If you want to display the wood on its own, then you’ll need some form of clear finish. Various oils and varnishes have been used to protect the wood for centuries. The most common clear finish is polyurethane, a tough polymer coating that’s durable, long-lasting, and easy to apply.

Depending on the formula, it can be used for interior or exterior applications and is available in oil-based, water-based, or water-borne oil formulas.

What is Polycrylic?

A newer type of clear finish from Minwax called Polycrylic sounds like it might be a type of polyurethane, but it’s different enough that DIYers should know the advantages and disadvantages of each before choosing between the two.

Polycrylic has a water-based formula, so it’s more environmentally friendly—it cleans up easily with soap and water and its VOC (volatile organic compound) levels are much lower, so it doesn’t emit the noxious fumes of solvent-based finishes. (Manufacturers still recommend adequate ventilation when using any finish.) The formula has an acrylic base; polyurethane is added for better adhesion and durability.

Polycrylic is not as durable as polyurethane and is meant to be used only on interior surfaces such as cabinets, furniture, and trim. It shouldn’t be used in exterior applications or on surfaces that are subject to lots of wear, such as floors, or that are exposed to water. There are other finishes, both solvent- and water-based, that are made specifically for floors and can handle the foot traffic.

How to Use Polycrylic

The recommendations for applying Polycrylic are similar to most types of finish, including polyurethane; it can be brushed or rolled. A high-quality synthetic bristle brush works well. It’s also available as an aerosol, which comes in handy if you’re finishing irregular or contoured surfaces.

Sheen choices include gloss, semigloss, satin, matte, and ultra-flat. Whether you’re brushing, rolling, or spraying, Minwax recommends a minimum of three coats.

A light sanding between coats will promote adhesion of the subsequent coats. At any time during the process, it’s recommended that you not use steel wool, because it can leave small particles that will rust in the finish. Instead, it’s best to use a nylon scrubby-type abrasive, such as 3M’s Scotch-Brite pads.

Polycrylic dries faster than polyurethane, so brush or lap marks can become a problem, making finishing large surfaces more difficult. It does take a bit longer to cure, however, so although it may be dry to the touch, it will take longer to dry completely. Polycrylic also has a thinner consistency than polyurethane, so you should watch out for drips and sags, especially if you’re applying it to a vertical surface.

Polycrylic vs. Polyurethane: Appearances Matter

Oil-based polyurethane imparts a slight amber tone to the wood, so it’s probably not what you want over a pure-white painted finish. Water-based polyurethanes lack that amber cast, but some still do cause white or light-colored surfaces to yellow after drying or become slightly cloudy over darker finishes such as milk paint.

Polycrylic, on the other hand, leaves a clear, non-yellowing surface, so it won’t change the appearance of lighter woods such as maple or birch, or anything painted white. Polycrylic is not recommended for use over dark-colored paints or red mahogany stain, however, where it’s clear appearance can become somewhat opaque or milky.

The Bottomline

The next time you’re in the paint aisle in search of the perfect protective finish, consider these points:

  • If your project is outside or might get tons of abuse indoors (like flooring), choose polyurethane. It’s tough. long-lasting, and relatively easy to use. However, in its oil-based form, it does off-gas during the drying process, so you’ll need adequate ventilation. And polyurethane imparts an amber cast to any surface, whether it’s raw wood or paint.
  • On the other hand, if you have a project inside such as light-colored furniture or interior trim, polycrylic should be your pick. It doesn’t smell as much as polyurethane, and best of all, it cleans up with soap and water.
Sours: https://www.thisoldhouse.com/painting/22174860/polyurethane-vs-polycrylic
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Directions

Instrucciones en Español

Interior Use Only

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:

  1. Surface must be dry and free of old finishes in poor condition, paint, wax, grease, polish, dirt or other foreign matter.
  2. Sand to obtain a smooth uniform surface. Remove all dust.
  3. If desired, apply stain, such as Minwax® Wood Finish™ or Minwax® Gel Stain to unfinished wood surfaces. Follow directions for application and dry times.
  4. Stir Minwax® Fast-Drying Polyurethane before and during use to eliminate settling on the bottom of the can. Stir to rotate the product from the bottom to the top of the can. NEVER SHAKE.
  5. Apply a THIN coat of Minwax® Fast-Drying Polyurethane using a high-quality natural or foam brush.
  6. Let dry 4-6 hours. Then lightly sand entire surface with fine sandpaper (220 grit) to ensure an even finish and proper adhesion. Remove all dust.
  7. For floor projects, use a square buff orbital or disk-type sander with 220 grit sandpaper or the equivalent grit pad or screen (specifically designed for sanding between coats). Do not use a belt or drum-type sander for sanding between coats. Follow the sander manufacturer's directions for your type of project.
  8. Apply a second coat. If a third coat is desired, repeat step 6 before application.
  9. After final coat, allow 24 hours before light use.

When used on hardwood floors, use a lambswool or synthetic pad applicator or natural bristle brush and maintain a wet edge to avoid lap marks. For maximum durability, we recommend three coats. Avoid heavy traffic and replacing of furniture for 72 hours after final coat. When replacing furniture, do not slide. Do not install rugs or clean floors for 7 days.

CLEANUP: Use mineral spirits or paint thinner following manufacturer's safety instructions.

COVERAGE: Approximately 600 square feet per gallon.

Note: Dry times and coverage rates are based on good ventilation, temperature of 77°F and 50% relative humidity. Lower temperature, higher humidity, lack of air movement or application of thick coats will extend dry time. Always test tackiness between coats. Do not sand or re-coat when surface is tacky. 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 or Minwax® Ultimate Floor Finish.

DANGER: Rags, steel wool, other waste soaked with this product, and sanding residue may spontaneously catch fire if improperly discarded. Immediately place rags, steel wool, other waste soaked with this product, and sanding residue in a sealed, water-filled, metal container. Dispose of in accordance with local fire regulations.

CAUTIONS: CONTAINS ALIPHATIC HYDROCARBONS.

Contents are COMBUSTIBLE. Keep away from heat and open flame.

VAPOR HARMFUL. Use only with adequate ventilation. To avoid overexposure, open windows and doors or use other means to ensure fresh air entry during application and drying. If you experience eye watering, headaches, or dizziness, increase fresh air, or wear respiratory protection (NIOSH approved) or leave the area. Avoid contact with eyes and skin. Wash hands after using. Keep container closed when not in use. Do not transfer contents to other containers for storage.

FIRST AID: In case of eye contact, flush thoroughly with large amounts of water for 15 minutes and get medical attention. For skin contact, wash thoroughly with soap and water. In case of respiratory difficulty, provide fresh air and call physician. If swallowed, call Poison Control Center, hospital emergency room, or physician immediately.|

DELAYED EFFECTS FROM LONG TERM OVEREXPOSURE. Contains solvents which can cause permanent brain and nervous system damage. Intentional misuse by deliberately concentrating and inhaling the contents can be harmful or fatal.

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

DO NOT TAKE INTERNALLY. KEEP OUT OF THE REACH OF CHILDREN.

Sours: https://www.minwax.com/wood-products/clear-protective-finishes/interior/minwax-fastdrying-polyurethane-350-voc-compliant
Cheap VS. Expensive Polyurethane // Water Based // Woodworking // Top Coat Durability Test

Directions

Instrucciones en Español
Instructions for using Minwax® Fast-Drying Polyurethane.

For aerosol directions, click here

Interior Use Only

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:

  1. Surface must be dry and free of old finishes in poor condition, paint, wax, grease, polish, dirt or other foreign matter.
  2. Sand to obtain a smooth uniform surface. Remove all dust with a cloth dampened with mineral spirits.
  3. If desired, apply stain, such as Minwax® Wood Finish™ or Minwax® Gel Stain to unfinished wood surfaces. Follow directions for application and dry times.
  4. Stir Minwax® Fast-Drying Polyurethane before and during use to eliminate settling on the bottom of the can. Stir to rotate the product from the bottom to the top of the can. NEVER SHAKE.
  5. Apply a THIN coat of Minwax® Fast-Drying Polyurethane using a high-quality natural or foam brush.
  6. For floor projects, use a square buff orbital or disk-type sander with 220 grit sandpaper or the equivalent grit pad or screen (specifically designed for sanding between coats). Do not use a belt or drum-type sander for sanding between coats. Follow the sander manufacturer’s directions for your type of project.
  7. Apply second coat. If third coat is desired, repeat step 6 before application.
  8. After final coat, allow 24 hours before light use.

When used on hardwood floors, use a lambswool or synthetic pad applicator or natural bristle brush and maintain a wet edge to avoid lap marks. For maximum durability, we recommend three coats. Avoid heavy traffic and replacing of furniture for 72 hours after final coat. When replacing furniture, do not slide. Do not install rugs or clean floors for 7 days.

CLEANUP: Use mineral spirits or paint thinner following manufacturer’s safety instructions.

COVERAGE: Approximately 125 square feet per quart.

Note: Above dry times are based on good ventilation, temperature of 77°F and 50% relative humidity. Lower temperature, higher humidity, lack of air movement or application of thick coats will extend drying times. Always test tackiness between coats. Do not sand or re-coat when surface is tacky. 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 or Minwax® Ultimate Floor Finish.

DANGER: Rags, steel wool, other waste soaked with this product, and sanding residue may spontaneously catch fire if improperly discarded. Immediately place rags, steel wool, other waste soaked with this product, and sanding residue in a sealed, water-filled, metal container. Dispose of in accordance with local fire regulations.

CAUTIONS: CONTAINS ALIPHATIC HYDROCARBONS.

Contents are COMBUSTIBLE. Keep away from heat and open flame.

VAPOR HARMFUL. Use only with adequate ventilation. To avoid overexposure, open windows and doors or use other means to ensure fresh air entry during application and drying. If you experience eye watering, headaches, or dizziness, increase fresh air, or wear respiratory protection (NIOSH approved) or leave the area. Avoid contact with eyes and skin. Wash hands after using. Keep container closed when not in use. Do not transfer contents to other containers for storage.

FIRST AID: In case of eye contact, flush thoroughly with large amounts of water for 15 minutes and get medical attention. For skin contact, wash thoroughly with soap and water. In case of respiratory difficulty, provide fresh air and call physician. If swallowed, call Poison Control Center, hospital emergency room, or physician immediately.|

DELAYED EFFECTS FROM LONG TERM OVEREXPOSURE. Contains solvents which can cause permanent brain and nervous system damage. Intentional misuse by deliberately concentrating and inhaling the contents can be harmful or fatal.

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

DO NOT TAKE INTERNALLY. KEEP OUT OF THE REACH OF CHILDREN.

Aerosol Directions

Interior Use Only

WARNING! If you scrape, sand or remove old paint, you may release lead dust. Lead Is Toxic. Contact the National Lead Information Hotline at 1-800-424-LEAD or log on to www.epa.gov/lead.

  1. The surface must be dry and free of old finishes in poor condition, paint, wax, grease, polish, dirt or other foreign matter.
  2. Sand to obtain a smooth, uniform surface. Remove all dust.
  3. If desired, apply stain, such as Minwax® Wood Finish™ Stain, to unfinished wood surfaces. Follow directions for application instructions and dry times.
  4. Shake Minwax® Fast-Drying Polyurethane vigorously for two minutes. Shake for 10 seconds occasionally during use.
  5. Protect adjacent areas from overspray. Wet overspray can be removed with mineral sprits.
  6. Hold can vertically 12 inches from surface. Depress button fully and spray using an even, sweeping motion with slightly overlapping strokes. On unfinished wood, apply sufficient material to seal open joints, edges and end-grain.
  7. Apply thin coats to avoid runs and sags. Recoat within 2 hours. If unable to do so, wait a minimum of 72 hours, then lightly sand and recoat.
  8. Apply at least three coats on unfinished wood and two coats on surfaces already finished.
  9. After final coat, allow 24 hours before normal use.

Note: Above dry times are based on good ventilation, temperature of 77°F and 50% relative humidity. Lower temperature, higher humidity, lack of air movement or application of thick coats will extend drying times. 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. Minwax® Polycrylic® Protective Finish is recommended over light-colored wood surfaces.

Nozzle Care

  1. After each use, clear valve by holding can upside down and spraying until only clear gas comes out.
  2. If spray button becomes clogged, wear eye protection, wipe off button opening with lacquer thinner- Do NOT stick pin in spray button opening.

CLEANUP: For easy clean-up, use lacquer thinner following the manufacturer’s safety instructions.

DANGER: Rags, steel wool, other waste soaked with this product, and sanding residue may spontaneously catch fire if improperly discarded. Immediately place rags, steel wool, other waste soaked with this product, and sanding residue in a sealed, water-filled, metal container. Dispose of in accordance with local fire regulations.

CAUTIONS: CONTAINS ALIPHATIC HYDROCARBONS AND KETONES. DANGER! EXTREMELY FLAMMABLE.

Keep away from heat, sparks, and open flame. Vapors will accumulate readily and may ignite explosively. Keep area ventilated during use and until all vapors are gone. DO NOT SMOKE - Extinguish all flames, pilot lights and heaters -Turn off stoves, electric tools and appliances, and any other sources of ignition. CONTENTS UNDER PRESSURE. Avoid prolonged exposure to sunlight or heat from radiators, stoves, hot water and other heat sources that may cause bursting. Do not puncture, incinerate, burn or store above 120°F. Keep upright in a cool, dry place. Do not discard empty can in trash compactor.

VAPOR HARMFUL. Use with adequate ventilation. Avoid continuous breathing of vapor and spray mist. To avoid breathing vapors or spray mist, open windows and doors or use other means to ensure fresh air entry during application and drying. If you experience eye watering, headaches, or dizziness, increase fresh air or wear respiratory protection (NIOSH approved) or leave the area. Overexposure may cause numbness in extremities which can persist for some period of time and may be permanent. Avoid contact with eyes and skin. Wash hands after using.

FIRST AID: In case of eye contact, flush thoroughly with large amounts of water for 15 minutes and get medical attention. For skin contact, wash thoroughly with soap and water. In case of respiratory difficulty, provide fresh air and call physician.

DELAYED EFFECTS FROM LONG TERM OVEREXPOSURE. Contains solvents which can cause permanent brain and nervous system damage. Intentional misuse by deliberately concentrating and inhaling the contents can be harmful or fatal.

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

DO NOT TAKE INTERNALLY. KEEP OUT OF THE REACH OF CHILDREN.

CONFORMS TO ASTM D-4236. Contact a physician for more health information.

Sours: https://www.minwax.com/wood-products/clear-protective-finishes/interior/minwax-fastdrying-polyurethane

Minwax polyurethane

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