Choosing the right wood finish is a decision you can’t escape when polishing wooden surfaces. You may think you can use any protective coat to achieve a durable finish, but did you know that not all finishing products can result in the same quality?
Today, our woodworking experts will conduct hands-on tests on lacquer vs. polyurethane wood finishes to determine which suits your project best.
About Lacquer
Most woodworkers would tell you lacquer is most effective when used as a wood furniture finish. However, its thin coats that provide quick-drying attributes make it suitable for a wide range of woodworking projects like wooden floors.
As you may already know, these resin residues are harvested from lacquer tree saps. Once refined, these products offer a glossy and extremely durable finish. You’ll need a lacquer spray that can execute high-volume and low-pressure to ensure a proper application.
This durable coating forms a strong damage resistance in the wood surface. Because of this, you can count on lacquer finishes to make workpieces last a long time.
Water-based lacquer
Compared to other oil-based finishes like tung oil, water-based lacquer carries less toxic components and odor. In fact, its enhanced durability allows it to last five years longer than nitrocellulose lacquers.
This lacquer also dries faster on the wood surface. Thanks to this, it takes less time and cost less money.
Acrylic lacquer
Besides its glossy finish, the best attribute acrylic lacquer can offer better than others is its resistance to yellowing. When this lacquer dries, users can expect it to yield a clear coat.
If you want a more flexible product, you can try the more durable option under this category: the CAB-acrylic lacquer. It’s less brittle than typical acrylic lacquers, so it’s not surprising that it’s wear and scratch-resistant.
The only downside of this option is it’s more expensive. It’s also the kind of chemical you need to apply using the spraying method when mixed with thinner.
This requirement eventually adds up to its cost, instead of the cheaper option of brushing lacquer on wood surfaces.
Nitrocellulose lacquer
Although not as long-lasting as water-based lacquers, nitrocellulose resins feature evaporative attributes. Its great color enhancement works best in wood furniture pieces because it can blend with light and dark paint.
Once nitrocellulose lacquer is applied over a wooden surface, it’ll form a protective layer to resist damage.
However, our experts suggest being careful when using a high volume of this finish as it’s highly flammable. Don’t spray it too much, and ensure you’re in a well-ventilated area.
Catalyzed Lacquer
Did you know that catalyzed lacquers are made with nitrocellulose and urea resins? This combination can form a more durable and longer lifespan than other oil-based finishes. You must add an acid catalyst with the lacquer’s liquid form to help it cure well.
If you’re not keen on mixing it, you can buy a ready-to-use pre-catalyzed lacquer. But of course, there’s no harm in choosing post-catalyzed lacquer. We advise reading the labels [1] and instructions thoroughly to avoid miscalculating the proportions.
Lacquer Finish Advantages and Disadvantages
Before you add any more coats to your kitchen cabinets and other wooden furniture pieces, take a moment to consider the perks and disadvantages of lacquer products.
It’s easy to assume any wood finish will fulfill your woodworking requirements, but here are some things you need to consider:
Pros
- Costs less than applying polyurethane finishes
- Dries in approximately 10 minutes
- High resistance to liquid components
- Widely available in many countries
- Smooth and transparent results
Cons
- It needs multiple coats
- Not too heat-resistant
How to Apply Lacquer
Since it has a thin consistency, the best method to try is to spray lacquer on the surface. It’ll give you smooth texture and even layers, but it doesn’t yield the best results for wide applications like wood floors.
See Also: What to Do When Lacquer Has Turned White
If you opted for a foam brush, apply it swiftly because this finish dries faster than you think. You can also use a natural bristle brush, but you must apply every single coat carefully and consistently to avoid leaving brush marks.
Before proceeding with the application, ensure that you wear the right protective gear to stay safe from harmful fumes. You must also sand down the material to make it smooth and even. Once that’s done, don’t forget to clean the dust particles from the surface.
Consult the manuals for the correct drying duration. Before adding the next coat, smoothen the area with 320-grit sandpaper and wipe it clean again. Repeat this process until you get the desired result. If you’re not satisfied, you can remove the lacquer from wood again and repeat the steps.
About Polyurethane
Polyurethane finishes are products made of plastic components in liquid forms. When applied, polyurethane coats surfaces with thick and glossy resin. It’s not the easiest finish to apply on hardwood floors, but you can fix that by mixing some thinning agent.
Its thicker consistency makes it unsuitable for spraying, so a bristle brush is the best option. The drying time for this finish may vary, but it forms a durable coat once dried.
Water-Based Polyurethane
Water-based alternatives are less toxic and faster at drying than oil-based polyurethane. It’s also more environmentally friendly because water-based polyurethane doesn’t leave a yellow tint upon drying and carries no odor.
Some of these finishes also include attributes of oil-based and water-based polyurethanes. You can apply them using a foam roller, bristle brush, or synthetic polymers.
The only problem with water-based polyurethane coatings is they can’t stand against heat. Because of this, we don’t recommend them for outdoor furniture pieces.
Oil-Based Polyurethane
While oil-based polyurethane has better durability, it takes around 24 hours to dry its application. Because of this tedious drying time, many woodworkers prefer water-based polyurethane alternatives.
The good news is it can withstand heat exposure, so using oil-based polyurethane for kitchen tabletops is justifiable.
Practice caution when applying multiple coats with oil-based polyurethanes, as an incorrect application may cause the surface not to process the finish well.
Polycrylic
Among the wood finishes available in the market, polycrylic carries the least toxic components and odors. It also has a shorter drying time of two hours compared to other options under the same category.
Polyurethane Finish Advantages and Disadvantages
While it’s true that polyurethane durability levels are impressive, it doesn’t mean you can grab any product on the shelf. You must consider these perks and drawbacks to determine if it’s worth your money.
Pros
- Highly durable and resistant to heat
- Not toxic and carries less odor
- It dries quicker (except for oil-based polyurethane)
Cons
- Extensive drying and curing time
- It may develop a yellow tint over time.
How to Apply Polyurethane
When applying these products, you can choose between natural-bristle and nylon-bristled brushes. You can also opt for foam brushes or rollers if you’re handling wider surfaces.
Like the previous method, you must sand the material first. Ensure that the wood-grain filler is layered properly and the surface is free of residues.
After that, apply the polyurethane in long and big motions. Let the first coating dry according to instructions before sanding it lightly to enhance adherence to the next application. You can repeat the process until the desired result, but two coats should suffice.
Recommended Reads:
Polyurethane and Lacquer In-Depth Comparison
Here is a detailed polyurethane vs. lacquer comparison based on important considerations:
Finish Quality
The good thing about polyurethane is you can choose from gloss or semi-gloss up to satin and matte finishes. Meanwhile, lacquer is only limited to extreme gloss and matte options.
Winner: Polyurethane
Ease of Application
If you inspect the options closely, you’ll notice that lacquer has a lighter consistency. Thanks to this, it’s an easier product to apply than polyurethanes. You can even apply it through spraying, so it’s the more convenient alternative.
Winner: Lacquer
Toxicity & Safety
Believe it or not, both lacquer and polyurethane carry high levels of volatile organic compounds or VOCs. The good thing is both options have less toxic variations like water-based lacquer and polycrylic.
Durability
Although it dries slower, polyurethane offers better durability than lacquer because of its thick consistency. And while the latter penetrates through the wood to make it long-lasting, it can develop discoloration and visible scratches over time.
Winner: Polyurethane
Drying Time
Since polyurethane is thicker, it takes longer to dry than lacquer. You’ll have to wait a few hours before polyurethane is dry to the touch. Meanwhile, lacquer often takes only ten minutes.
Winner: Lacquer
Yellowing
Both finishes have tendencies to show a yellow tinge over time, but polyurethane products tend to show signs of it earlier than others.
The good news is you can always opt for the water-based options on both types. Due to these variations between lacquer vs. polyurethane, we consider them tied for this round.
(But here are the top-rated non-yellowing polyurethanes we highly recommend!)
Versatility
As mentioned above, lacquer’s smooth attributes best suit furniture pieces. On the other hand, polyurethane’s durability works best for surfaces with frequent usage and traffic, like wood floors.
Since lacquer has shorter drying times, it’s not versatile enough for wider applications. And even though polyurethane dries slower, it can work better in different projects.
Winner: Polyurethane
Number of Coats
Lacquer has a thinner consistency, so adding multiple coats won’t take as long as applying polyurethane. Although the latter requires fewer coats because of its thickness, it’s hard to deny that it’ll take longer than the other option.
Related Read: How Many Coats of Polyurethane Do You Need to Apply?
Winner: Lacquer
Cost
Both products have varying price ranges, depending on the brand, quality, and other factors. However, lacquer’s cost is added to the need for a spray tool. You may not know, but sprays are more costly than regular brushes.
Winner: Polyurethane
Poly and Lacquer Comparison for Exterior Wood Surfaces
As we applied these finishes on outdoor surfaces, it’s not hard to notice how polyurethane shows signs of cracks and peels when exposed to changing weather conditions. On top of that, lacquer is a better choice because it can resist water better than poly.
High-Traffic Surfaces
You must consider the most durable option if you apply finishes on high-traffic surfaces like wooden floors.
Banisters and Floors
Since lacquer has an extremely glossy finish, it’ll show scratches on high-traffic areas, like floors.
Because of this, you may need to opt for polyurethane because they offer more matte effects. You’ll also need to use the same finish on banisters to show consistency.
Tabletops
Since tabletops are frequently used and exposed, it’s great that both options offer adequate resistance against heat and moisture. Nevertheless, you must know that polyurethane features better protection against water damage.
Cabinets
When finishing cabinets, the product you’ll need depends on the material’s paint quality. And because some cabinet types are covered with high-sheen paints, applying wood finishes isn’t necessary.
However, you can opt for a thin coat of polyurethane for added durability if the cabinet has low-quality paintwork.
How to Apply Polyurethane Over a Lacquer Finish
First, the chances of polyurethane adhering to a lacquer finish are very low. But if you need to do it, add some alkyd-resin varnish to the poly mixture to make them stick together.
(How about painting over a lacquer finish? It is advisable? Read next!)
FAQ
How water-resistant is lacquer?
It depends on the type of lacquer finish you’ll use. If you’re keen on solvent-based coats, add acrylic lacquer thinner to enhance their water resistance.
Can you use a brush to apply lacquer and polyurethane?
You can use brushes to apply lacquer and polyurethane. Since the latter has a thicker consistency, applying this product with tools like spray cans can be hard.
When using a brush, it is important to choose one with bristles suitable for the specific finish being applied. For lacquer, a brush with natural bristles is typically recommended, while synthetic bristle brushes are commonly used for polyurethane.
Also Read: Can You Roll Polyurethane On Wood?
Is it recommended to apply only one layer of lacquer?
You must apply it in many thin layers to form a durable finish because this product doesn’t have a thick consistency.
Do you need to sand between coats of poly?
It would be best to sand the surface between poly coats with 320-grit sandpaper to enhance surface adhesions. There are cons if you don’t sand between coats of polyurethane, and you would want to avoid that.
You Might Want to Read: Stains vs Varnishes
Conclusion
After the head-to-head polyurethane vs. lacquer comparison, it’s clear that these finishes work best in different projects and environments.
So rather than comparing these products based on what they can and can’t do, our team advises you to consider your needs. Take a step back and assess which option will get the job done better.
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