Difference Between Polyurethane and Lacquer

Furniture has wood as its base material. Finishing is the penultimate process in the manufacture of wooden furniture. It gives gloss and other desirable characteristics to the wooden surface.

/10

Science Quiz

Test your knowledge about topics related to science

1 / 10

Quartz crystals normally used in quartz clocks etc. is chemically

2 / 10

Which of the following compound is mainly used in hand sanitizer?

3 / 10

Acid turns blue litmus paper into which color?

4 / 10

Which device is used for measuring air pressure?

5 / 10

Which is the type of food having maximum energy?

6 / 10

Soda water contains

7 / 10

Potassium Permanganate is used for purifying drinking water, because

8 / 10

What is the scientific name of humans?

9 / 10

Where does photosynthesis take place?

10 / 10

The 'photo' in photosynthesis means to do with...

Your score is

0%

Finishing closes unwanted pores on the wooden surface. Therefore, it eliminates the possibility of a breeding ground for the bacteria.

There are different types of varnishes and oil-based coatings available in the market. Polyurethane and lacquer fall under this category. However, they are very different from each other.

Polyurethane vs Lacquer

The difference between polyurethane and lacquer is that polyurethane is a thick coating that forms a protective layer over the wooden surface, whereas lacquer is a thin coating that provides protection by penetrating into the surface.

Polyurethane vs Lacquer

Polyurethane is a varnish that is composed of microscopic resin molecules. It can be oil or water-based. It provides a very protective finish to the wooden surface.

Lacquer is a popular wood coating that produces a hard and durable finished surface. It dries by the solvent evaporation process, and its drying rate is very fast.


 

Comparison Table

Parameter Of ComparisonPolyurethaneLacquer
Thickness of CoatingIt is a thicker coating.It is a thinner coating.
Surface PenetrationForms a layer over the surface.Penetrates into pores.
Drying TimeIt takes a longer time to dry due to the thickness of the coating.It takes less time to dry as the coating is thin.
Multiplicity of CoatsMultiple coats cannot be applied simultaneously due to longer drying time.Multiple coats can be applied simultaneously due to a shorter drying time.
Applied UsingIt is applied using a paintbrush.It is applied using a spray.

 

What is Polyurethane?

Polyurethane is a varnish that contains chains of resin molecules. It forms a protective layer over the wooden surface and doesn’t penetrate deeper.

The polyurethane coating is highly durable. It provides protection from water and other chemicals. It is applied using a paintbrush.

There are three types of polyurethane coatings. These are oil-based, water-based, and water-based oil-modified. The oil-based polyurethane coating is very durable.

It forms a hard film in a few coats. However, it takes a longer time to dry than water-based coats.

The water-based polyurethane coating gives a crystal-clear gloss to the wooden surface. It dries quickly, but more coats are needed. The wooden surface should be properly ventilated while applying the coating.

The water-based oil-modified polyurethane coating dries to become a tough oil-like film. It dries very quickly. Polyurethane coating can be removed using a plastic scraper or sandpaper.

polyurethane
 

What is Lacquer?

Lacquer is a wood finish that dries by a process called solvent evaporation. It is less durable when compared to polyurethane coatings.

The lacquer coating penetrates into the wood and prevents the breeding of harmful bacteria by clogging pores. Since it is thinner, it also dries very fast. A spray is used to apply lacquer coating.

There are many types of lacquer coatings. These are shellac-based, urushiol-based, nitrocellulose, acrylic, and water-based lacquers. Shellac is obtained from the secretions of the lac bug. It produces a red pigment for surface finishing.

Urushiol-based lacquers use oxidation and polymerization along with evaporation, to set on the surface. Urushiol is a mixture of phenols and proteins.

This lacquer dries very slowly. However, the coating is very strong and resistant to acids and other chemicals.

Nitrocellulose lacquers contain nitrocellulose, which is obtained from the nitration of cotton and cellulose. They provide a hard, flexible, and waterproof finish.

Acrylic lacquers use the acrylic polymer. They dry extremely fast. Also, there is no need to further polish the surface as enough shine is imparted by this lacquer.

Water-based lacquers dry very quickly, and are also less hazardous. However, they are not suited for coating external surfaces. The lacquer coating can be removed from the surface by using a solution of denatured alcohol and lacquer thinner.

lacquer

Main Differences Between Polyurethane and Lacquer

Polyurethane and lacquer are wood finishes. They add gloss to the wooden surface.

The main differences between the two are :

  1. Polyurethane coating is thicker, whereas lacquer coating is thinner.
  2. Polyurethane simply acts as a protective layer, whereas lacquer penetrates deep inside.
  3. The polyurethane coating takes more time to dry, whereas the lacquer coating dries quickly.
  4. Multiple coats of polyurethane can’t be applied simultaneously, whereas multiple coats of lacquer can be applied quickly.
  5. Polyurethane coating is applied using a paintbrush, whereas lacquer coating is applied using a spray.
Difference Between Polyurethane and Lacquer

References

  1. https://www.thisoldhouse.com/painting/21018327/all-about-polyurethane
One request?

I’ve put so much effort writing this blog post to provide value to you. It’ll be very helpful for me, if you consider sharing it on social media or with your friends/family. SHARING IS ♥️