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How to Brush Polyurethane Without Bubbles – Wood Working Skills

Benjamin Wilson by Benjamin Wilson
November 27, 2022
in Woodworking Tips
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How to brush polyurethane without bubbles

How to brush polyurethane without bubbles?

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How to Brush Polyurethane Without Bubbles? Can I efficiently brush polyurethane without bubble formation? This is a daunting question to many while doing the varnishing work. The appearance of bubbles interferes with the general outlook of a wooden surface. Therefore, avoiding them from the first place is the key. As you do the brushing, employ much care on every inch.

You stand a chance of reducing the bubble development by avoiding much turbulence in the application process. The spraying of the finishes perfectly deals with this as compared to the brushing work. Even so, the spreading of polyurethane can be game-changing when you do it smoothly. It curbs the chances of trapping air films in between the varnishes. Remember to use some medium to high grit sandpapers for the sanding work. Let’s get started to find the answer of How to Brush Polyurethane Without Bubbles.

Table of Contents

  • Proper Sanding
  • In-Between Coats Sanding
  • Polyurethane Thinning
  • FAQs
  • Conclusion

Proper Sanding

To answer the question of how to brush Polyurethane without Bubbles, we must first do proper sanding. Before the application of the polyurethane, prepare the wooden surface well. Most old wood at times has rough surfaces which require some leveling. Sanding every inch makes you create a proper runaway for the finishes. Start by the low-grit sandpapers as they are coarser thus get deep into the surface well.

As you progress, use higher-grit papers such as 120-grit and 180-grit. This smoothen the surfaces well. Afterward, do the wiping of the wood dust. It may be a nice idea to use an air compressor here. Brushing polyurethane at such a surface minimizes the chances of bubble formation in a great way.

How to Brush Polyurethane Without Bubbles - Proper Sanding
How to Brush Polyurethane Without Bubbles – Proper Sanding

In-Between Coats Sanding

After successfully applying the first coat of polyurethane, the battle is not over yet. The bubbles can develop from the consequent layers to make. It is therefore necessary to remember the sanding procedure each time you brush a film of the finish. Give enough time for the dry-up of every coat before adding another.

Each time you do the scrubbing of a layer, let it be followed by a proper wiping of rub offs. This removes any particle which may be stuck in the films hence interfere with the whole project. I find the use of two clean clothes for the whole wiping being significant. Going for a paper towel or dampened rag is a wonderful idea.

How to Brush Polyurethane Without Bubbles - In-Between Coats Sanding
How to Brush Polyurethane Without Bubbles – In-Between Coats Sanding

Polyurethane Thinning

The 3rd step in the series “How to Brush Polyurethane Without Bubbles” is polyurethane thinning. Most finishes are thick as you open them in the cans. As much as this is helpful in the coating of surfaces, there is a downside to it. Smearing thick polyurethane maximizes the possibility of puddling, running, and bubbling. Therefore, the trick is to not apply one thick layer at once but rather several thin coats on a surface.

Thinning the polyurethane in the ratio of three to one may work well for anyone against bubbling on the varnishes. For oil-based polyurethane, the mineral spirit needs to be your pick. Water will serve you well if the finish is water-based. What you need is to be gentle with the mixing to avoid trapping air into the mixture. From the thinning, you make the spreading of the finish easy thus scrapping off the chance of bubbling.

How to Brush Polyurethane Without Bubbles - Polyurethane Thinning
Polyurethane Thinning

Brushing polyurethane on a wood surface is at times faced with drawbacks such as bubbling. The good thing is that one can be safe from this by being gentle with the spreading. Before then, prepare the wooden surface well through sanding work. Make the polyurethane possess the right thickness by adding solvents in the right proportions.

FAQs

What is the ideal method for brushing polyurethane on?
Utilizing the best method for the surface, apply the first coat of polyurethane. Use a bristle brush to apply a thin coat to flat surfaces. With the texture of the cloth, gently wipe curved surfaces. Drips are more likely to form when brushing a surface that is rounded, curved, or vertical.

How much polyurethane should you dip your brush into?
Gently slap the brush against the inside of the container after dipping it into the finish about one-third of the way. The brush becomes too dry after being scraped over the edge of a container to apply the proper thickness of coat. It’s the most effective approach to ensure an even appearance and work the finish into the wood pores.

How much time should pass between polyurethane layers?
Only two coats of water-based polyurethane should be applied in a single day, and they must dry completely between coats. It’s critical to keep in mind that temperature and humidity have an impact on drying time.

Do you use a brush or a rag to apply the polyurethane?
Due to its extreme durability and water resistance, polyurethane has largely taken the place of varnish and shellac as a wood finish. Originally, it had to be brushed on, but thanks to new formulas, it may now be sprayed on or applied with a rag.

Conclusion

This article is an answer to the questions: “How to brush polyurethane without bubbles?”. Thanks for reading and I hope this article will be useful to you in your woodworking process. See you next time at woodworkingskills.com

Tags: brush polyurethanebrush polyurethane without bubblesHow Do I Brush Polyurethane Without Bubbles
Benjamin Wilson

Benjamin Wilson

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