Asked by: Tertuliano Charnolusky
hobbies and interests woodworking

How do you finish polyurethane on wood?

Last Updated: 13th January, 2020

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Apply a very thin coat of polyurethane with afinebrush, foam pad, or cloth. Work with the grain, and avoidapplyingtoo much polyurethane to avoid raising the grain.The initialcoat should be dry within a couple of hours, and youcan then applya second coat.

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Furthermore, how do you finish the final coat of polyurethane?

Polyurethane Finish Tip#1: Start With aThickCoating Sand lightly with 240-grit sandpaperbetweencoats, then let the last coat dry for at least24hours. This is standard practice with any woodfinishingjob, and is nothing out of theordinary.

Secondly, what happens if you don't sand between coats of polyurethane? A:Nothing,provided you apply each coat of finish withinareasonable amount of time. If you get dust nibs orbrushmarks in the finish, sanding will smooth them, and yournextcoat will look better if you work on asmoothsurface.

Simply so, do you have to put polyurethane over stain?

While staining creates a rich, deep colorthathighlights natural wood grain, it does not providelong-termprotection. Without a protective top coat, wood canbedamaged easily due to contact with water, food, or sharp objects.Apolyurethane top coat protects the wood fromscratches,stains and water damage.

Can you apply a second coat of polyurethane without sanding?

Issue sanding between coatsofpolyurethane. Apply a THIN coat ofMinwax®Fast-Drying Polyurethane using a high-qualitynatural orfoam brush. Let dry 4-6 hours. Then lightly sand entiresurfacewith fine sandpaper (220 grit) to ensure an even finish andproperadhesion.

Related Question Answers

Delinda Bueschkes

Professional

Can you use a roller to apply polyurethane?

Polyurethane is easily applied with a paintbrushor roller and dries quickly. Applying thematerialwith a roller eliminates brush strokes and linesandprevents over-applying the material. Yes, you canusea paint roller to apply polyurethane.

Lidiya Golovan

Explainer

Can you apply polyurethane with a rag?

Standard polyurethane is applied with a brush,butthere are also wipe-on formulas that are applied with arag,as well as a spray finishes in aerosol cans. Regardlessof the typeyou use, if your project will see a lotof wear andtear, few finishes are as appropriate aspolyurethane for theprotective top coats.

Shuli Baiborodov

Explainer

Do you sand the final coat of Polycrylic?

FINISH APPEARS MILKY IN CAN BUT DRIESCRYSTALCLEAR. Apply a thin coat of PolycrylicFinishwith a high-quality synthetic bristle brush. Let dryat least 2hours then sand with very fine sandpaper (220grit) toensure an even finish and proper adhesion ofadditionalcoats. Do not use steel wool.

Timea Mulhause

Explainer

Which is better oil based or water based polyurethane?

COLOR: Oil based poly has an amber hue,whereaswater based poly is clear. An oil basedpolyurethanewill continue to amber and darken over time, whilewaterbased poly will remain clear for the lifetime of thehardwoodfloor. Water based poly dries much faster, andseveral coats(up to 4) can be applied in one day.

Christiane Ser

Pundit

What happens if you apply polyurethane before stain is dry?

As a rule of thumb, you should wait 24-48 hourstoallow the stain to fully dry before applyingyourpolyurethane. If you're extra cautious,youmay even choose to wait 72 hours before applyingyour poly.Below, we'll cover some of the factors that canaffectstain drying time.

Bouchara Badalyants

Pundit

How many coats of polyurethane should I use?

There needs to be 3 coats of Polyurethaneapplied,especially if you are using an oil-based finish.The firstcoat should be mixed with mineral spirits. Thisacts as asealer and provides a barrier between the wood and theoil finishyou are using. A bristle brush is needed to applythecoats.

Lilia Magni

Pundit

Does polyurethane seal wood?

The answer is no, polyurethane does notmakewood waterproof even if you coat all sides and endswithmultiple coats… at least not for very long.Woodexpands and contracts and naturally contains moistureeven whenkiln dried. As it moves it eventually compromises thefinish andallow wetness to invade.

Yousif Stockel

Pundit

Do I need to seal wood before polyurethane?

NOTE: Water-based stains will need a finesandingwith 220-grit sandpaper after the stain is dry. Also, somestainsare self-sealing. To seal the woodbefore topcoating, thin your oil-based polyurethane toone partmineral spirits and two parts polyurethane (first,gentlystir the contents in the can).

Nail Tenhaken

Pundit

What does Polyurethane do wood?

Polyurethane does not penetrate the surface ofthewood like other types of finishes. It dries on top ofthewood and becomes a clear finish that providesanabrasion-resistant seal for the wood. It dries clear sothefinish is a transparent and hard protective coat.

Stefany Lutterjohann

Teacher

How long does water based polyurethane last?

For oil based poly, it usually takes 30 daystofully cure. But, with water based poly, thecuringtime can be cut down to 2 weeks. While you canwalkon the floors much sooner (often after 24 hrs),thefloors are still vulnerable during thecuringprocess, and that means they can scratch muchmoreeasily.

Felicitas Heidecker

Teacher

How do you weatherproof wood?

There are three surefire ways to waterproof your woodforyears to come.
  1. Use linseed or Tung oil to create a beautiful andprotectivehand-rubbed finish.
  2. Seal the wood with coating of polyurethane, varnish,orlacquer.
  3. Finish and waterproof wood simultaneously with astain-sealantcombo.

Zinab Baldonedo

Teacher

What is the difference between varnish and polyurethane?

Varnish. While polyurethane is water-oroil-based plastic resin, varnish is older and madefromresins, oils, and solvents. Because of the higher ratio ofsolids,varnish is less susceptible to ultravioletlightdamage.

Chedey Gil Ortega

Teacher

Is polyurethane toxic to humans?

Polyurethane, a petrochemical resin thatcontainsisocyanates, is a known respiratory toxin.Uncuredpolyurethane can cause breathing problems such asasthma.Children and people with respiratory diseases areespeciallysensitive to the toxic chemicalsinpolyurethane.

Phylicia Salegui

Reviewer

Can I use a foam brush to apply polyurethane?

Apply polyurethane using a bristle orfoambrush about 2″ wide. Foam works wellandeliminates the chore of cleaning, because the brushesarecheap and thus disposable. You can apply the first coatfullstrength or thinned up to half with paint thinner, making,ineffect, a wiping varnish. (Use a separate canorjar.)

Catrin Ranera

Reviewer

Is water based polyurethane waterproof?

No, polyurethane does not makehardwoodwaterproof, but it does make wood waterresistant.Polyurethane gives hardwood its protection. Itrepelswater and prevents water absorption, but itneverfully blocks it so it will never make it 100%waterproof.Polyurethane also protects wood forscratches anddiscoloration.

Mansoura Mennicke

Reviewer

Do you need to seal wood after staining?

Most stains should be sealed to preventbleeding.After smoothing the stained wood, applyasealer coat of thinned shellac, sanding sealer,orother appropriate sealer. Do not use shellac withNGRor water-base stains. If you plan to finish the piecewithpolyurethane, make sure the sealeriscompatible.

Dayara Friera

Reviewer

Does polyurethane make stain darker?

Oil based polyurethane will darken some woodsandsome stains slightly. The three layer techniquewillgive you a uniform dark color withoutmaking the woodlook painted, but consistent colordoes depend somewhat ongood spraying skills for the lastcolor coat.

Benemerito Geerken

Supporter

Do I have to clear coat stained wood?

Do I have to apply a clear coatafterstaining? While staining creates a rich, deepcolorthat highlights natural wood grain, it doesnotprovide long-term protection. A polyurethane topcoatprotects the wood from scratches, stainsand waterdamage.

Johny Durschmied

Supporter

Do you sand the last coat of polyurethane?

Polyurethane Finish Tip#1: Start With aThickCoating
Sand lightly with 240-grit sandpaperbetweencoats, then let the last coat dry for at least24hours. This is standard practice with any wood finishing job,andis nothing out of the ordinary.