What is a Lacquer Thinner – What is it Used For?

You probably have heard the term lacquer thinner and know from the name itself that it is designed to thin out lacquers. But there is more to the product than the name.

So, what is lacquer thinner exactly? It is a combination of solvents that can dissolve the plastics or resins used in modern lacquer products. As with most products containing solvents, it is highly flammable, emits strong odors, and creates harmful fumes when breathed in.

Lacquer thinner, also known as cellulose thinner is a go-to mighty solvent for industries like automotive, woodworking, and painting. Whether it’s smoothing out lacquer-based paints, reviving gunked-up brushes, or kicking stubborn residues—think dried paint, adhesives, or grease—to the curb, lacquer thinner gets the job done.

But don’t let its efficiency fool you; with rapid evaporation and potent dissolving power, it demands respect (and careful handling). In this guide, I’ll break down what makes lacquer thinner, its core ingredients, where it shines compared to other solvents, and how to stay safe while working with it.

What is Lacquer Thinner Made From?

Depending on the brand of the product itself there are different solvents that are being used. But the most common ingredient items in the lacquer thinner include the following.

• Acetone
• Butyl Acetate
• Methyl Ethyl Ketone
• Toluene
• Xylene

Historically, lacquer thinners contained alkyl esters (e.g., butyl or amyl acetate), ketones (like acetone or methyl ethyl ketone), aromatic hydrocarbons (such as toluene), ethers (e.g., glycol cellosolves), and alcohols. Many formulations also featured non-hazardous additives, such as soy-based oils, dibasic esters, and glycol or carbonate compounds like tetrahydrofurfuryl alcohol.

However, newer formulations prioritize low-VOC (volatile organic compound) compliance as a result they now rely heavily on acetone, with only minimal traces of aromatic solvents. When in the can it does appear to have a color, but that fades away as the thinner is applied and dries.

With proper care, there are different uses for this product, so let’s take a look at them.

Lacquer Thinner Applications

While there are specialized products that work just as well as lacquer thinner with less toxic ingredients, the thinner itself is a better-generalized product that can be used on a wide variety of items.

But before we discuss the uses of lacquer thinner, be aware that the toxicity and flammability of the product make it dangerous to use without considerable care.

So, it is best to test it on small out-of-the-way surfaces first and then judge the results. Also, wear a mask, and gloves, and be in a well-ventilated area while using this product.

1- Thinning Agent

The primary purpose of lacquer thinner is to thin paint products that are made with lacquer or are lacquer-based. You can also use it to thin NGR stains (non-grain-raising stains) oil-based paints, and varnishes. But do not use them for thinning oil-based stains or water-based stains.

Basically, it’s a solvent blend used to dissolve resins and plastics in modern lacquers. So, it dilutes and changes the properties of lacquer, such as its viscosity very well.

In addition, it also makes the lacquer flow easier out of a spray gun. By adding a small amount of thinner you can make the lacquer flow better to create a finish that is smooth, glossy, and free of streaks.

Remember that lacquer thinner should be added a little at a time to produce the right consistency. Otherwise, adding too much will make the lacquers or paint itself running and too thin.

2- Cleaning Agent

Unlike water which does little to break up the paint, the solution of chemicals that make up the lacquer thinner is perfect for dissolving or breaking up lacquers, paints, oils, grease, and any materials that have strong adhesive qualities.

So, lacquer thinner is also used to effectively clean surfaces, brushes, rollers, and spray paint devices after lacquer paints have been used for lacquer finishing.

Keep in mind that because many lacquer thinners contain kerosene, it is a powerful solvent against the paint. This means that if you have spots of paint from drips, for example, you can quickly clean them away using lacquer thinner.

Even hardened stains (of adhesives, rust, inks, aniline dyes, varnish, or shellac) on doorknobs, hinges, or similar surfaces can be removed when applying a little lacquer thinner. Just put a little on a cloth and rub it on the surface. You may want to pour a little, just enough to cover the paint spots, let it sit for a few seconds, then rub it away.

TIP: Lacquer thinner can cause great damage to the old clear coat. So avoid using them for cleaning the surfaces with clearcoats.

3- Powerful Degreasers

Much like mineral spirits and many other solvents used in industries such as automotive, lacquer thinners can be used as an industrial degreasing agent as well.

Because it’s lighter than most chain lubes, you can use them for cleaning your drivetrain and many other car’s components – it does a perfect job to remove grease, sticky tar, tree sap or other hardened substances effeciently.

Beyond that, this robust degreaser can tackle leftover residue from wood, masonry, and metal surfaces. Basically, if your surfaces or clothing stuck, stained, or splattered—lacquer thinner’s ready to roll up its sleeves and handle it by wiping out varnish stains and evicts pesky paint spots.

Tips for Opening and Using Lacquer Thinner?

Paint and lacquer thinners may come in a variety of different containers that vary in size and shape. Most of them are however packed in a metal can like that of paint.

Since these are flammable and can evaporate quickly you will need to make sure that you open up the lid carefully using the right opener tool.

If you do not have an opener you can try opening the can by using a screwdriver, ice pick, swiss army knife, fork, etc. Just pierce it from the top of the lid and twist it to break the seal. While making use of a can opener tool to open the lid, do not apply too much pressure as it can damage or deform the lid making it hard to close after usage.

You can find a good video here if you find your thinner can too stubborn to open.

Once you crack open that can, mixing lacquer with thinner in your spray gun’s holding cup is the way to go. The magic ratio of thinner to lacquer can vary depending on your project, but a good starting point is around 10–20% thinner.

Just remember, achieving the right consistency is key to a smooth application. Too much thinner, and you might lose the lacquer’s integrity; too little, and it could go on thicker than you intended. So, get ready to experiment and find that sweet spot before you add thin coats to build up that flawless finish.

Disposing of and storage tips

A few safety guidelines you need to follow with lacquer thinners are:

1. Do not dispose of the solvent into the drains or soil in your garden. Treat it responsibly and dispose of it following local hazardous waste guidelines.
2. Do not store leftover lacquer thinner in a plastic or rubber container as it can melt the plastic and cause a mess. Moreover, as the vapors need enough room to expand do not fill the container completely – it can burst.
3. Also, store the left solvent in a place that is well-ventilated. I usually keep the thinners and other solvents away from home in a shed in my backyard.

What if you get lacquer thinner on your skin?

Ingredients in lacquer thinner are labeled hazardous and hence if it gets on your skin you should wash off your skin immediately with soap and water.

For people with sensitive skin, there may be a burning sensation or unbearable pain. It can also cause annoyance due to issues like redness, mild cracks, or spot-specific dryness. If after washing the problem continues, you should get in touch with your doctor to get medical help.

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Are Lacquer Thinner and Paint Thinner the Same?

In short, paint thinner and lacquer thinner aren’t the same – but different. Even though they both come from the same source (petroleum) and are considered noxious, they come with significant differences that make them effective for yielding different finishes.

The basic difference between a paint thinner and a lacquer thinner lies in the differences in their chemical composition and flammability. Since lacquer thinner is richer in volatile hydrocarbons and light molecules (that vaporize easily), it’s more volatile and flammable compared to paint thinners.

Remember, the actual composition of the thinners may vary depending on the distillation process it has undergone.

Unlike most paint thinner (with heavier molecules), lacquer thinner is a blend of two or more solvents (like xylene, acetone, toluene, and methyl ethyl ketone) which are made up of lighter molecules.  

Also, due to the fact that the molecules in the paint thinner are heavier (usually because of the Stoddard solvent it includes), it carries an oily texture. Lacquer thinners, on the other hand, vaporize quickly and hence make your finger feel cold when touched.

What about mineral spirits or denatured alcohol?

Mineral spirit is a more refined form of paint thinner and is not as stinky as paint thinners. Also, it releases less odor.

Unlike, paint thinner or lacquer thinners they are usually more effective even when applied in smaller quantities. That’s the reason you can use them (instead of thinners) for fiberglass or gel coats without hurting the surface.

Remember that many people in different countries use the terms “mineral spirits” and “denatured alcohol” interchangeably for one another. Although both of them are effective for thinning enamel paints (lacquers or shellacs) and cleaning brushes, they aren’t the exact same products.

Unlike, mineral spirits and thinners denatured alcohol carries high-VOC solvents and evaporates faster. Also, due to the fact that it is more hazardous than many other solvents, denatured alcohol is now banned in many countries.

Can I Use Lacquer Thinner in Place of Paint Reducers?

Using lacquer thinner in place of paint thinner (or vice versa) isn’t just risky—it’s a recipe for disaster. So, you can’t swap them freely.

While most solvents, thinners, and reducers live in the same chemical family, they aren’t exactly interchangeable siblings.

“Solvent” is just the umbrella term for all the hardworking chemicals—whether they’re thinning, cleaning, or dissolving.

Lacquer thinners are specifically created for lacquers, making them perfect for dissolving and thinning lacquer-based paints. Whereas reducers are the go-to for enamels and urethanes, helping these coatings flow smoothly during application.

This also means, lacquer thinner is too aggressive for paints and coatings that aren’t formulated for it, leading to poor finishes, separation, or even damage. Similarly, reducers that vehicle painters use to thin the automotive paint won’t cut it for lacquers; it simply lacks the right chemical punch.

What are a Few Household Alternatives to Lacquer Thinner?

Just in case you are low on budget or have finished up your solvent in between the project, there are a few lacquer thinner alternatives that can be used.

Some of the household products that may work for you without hurting your wallet too badly include:

• Kerosene oil
• Windex
• Acetone
• Turpentine
• Methylated spirits
• Tamiya lacquer thinner
• Isopropyl rubbing alcohol

Few people also claimed to use brake-fluid, gun cleaner solvent, carburetor cleaner, and Goof Off (or Goo Gone) for removing super glue, epoxy primers, paints, varnishes, polyurethane, etc.

While I have personally used turpentine, rubbing alcohol, and kerosene as a good alternative to lacquer thinner, I am not sure how well these other products can work for your project.

If you plan to use these other alternates, I recommend trying them in smaller quantities first so that you don’t damage the finish on your surfaces.

The Bottom Line

Oil-based paints and lacquers are among the preferred coatings for exterior surfaces, trims, home furniture, and kitchen/bathroom cabinets.

However, a good thinning solvent like a lacquer thinner is what you require to get the right sheen and finishes on these surfaces, especially when spraying lacquer with a spray gun.

Since the chemicals in it can also work to dissolve oils and greases, it can be used more than a paint thinner – like for cleaning auto parts, tools, and other machine components made up of metal. Just make sure that you read all the manufacturer’s guidelines first, to ensure you do not damage anything it’s not compatible with.