What Lacquer Thinner Is
Lacquer thinner is a strong liquid thinner and solvent. Containing up to ten ingredients, lacquer thinner is a compound with mixture ratios that vary between manufacturers. Lacquer can sometimes be too thick to brush on or spray. If thick lacquer is applied, the resulting finish may be bumpy, pitted, or have an orange-peel effect. In the same way that water thins out the molecules in water-based products, lacquer thinner has the right chemical properties to separate (or thin) the molecules in lacquers. At $20 or more per gallon, lacquer thinner is an expensive thinner/solvent that should only be used sparingly. Lacquer thinner should never be poured down the drain, as it is considered a household hazardous waste and it can contaminate the local environment when not properly disposed of. Research responsible disposal options in your area.
When to Use
Clean up lacquersImprove viscosity of thick lacquersClean toolsClean paint sprayerClean off inks and adhesives
What Paint Thinner Is
Paint thinner is any liquid product that thins or acts as a solvent for oil-based paints and other coatings. The term paint thinner describes the product’s function, not the ingredients. So, even eco-friendly products derived from citrus, soy, pine (for turpentine), or other organic materials technically fall under the paint thinner category. Most often, though, paint thinner is made from pure mineral spirits. Or paint thinner might be produced from mineral spirits, with additives such as benzene. Paint thinner is clear and has low or no odor.
When to Use
Thin out oil-based paints, varnishes, or stains to make them less viscous Help paints flow better through paint sprayers Clean brushes Wipe off oily surfaces Clean oily tools Run through paint sprayers to clean hoses and internal workings
Are Lacquer Thinner and Paint Thinner the Same?
Compositionally, lacquer thinner and paint thinner are not the same. In fact, they share no ingredients. A visual scan of all ingredients making up more than 5 percent in both products shows the sharp contrast: Generally, it’s best to avoid substituting lacquer thinner for paint thinner or the other way around. Manufacturers do not recommend lacquer thinner for use as a paint thinner or solvent. Conversely, paint thinner isn’t designed for dissolving lacquers. Its composition just isn’t right for this use.
Lacquer Thinner vs. Paint Thinner Strength
Lacquer thinner is more powerful than paint thinner. Lacquer thinner is so powerful that it will even soften cured, dried lacquers and other oil-based coatings. Lacquer thinner can damage plastic and rubber and it can even strip car paint. Lacquer thinner acts quickly and aggressively to dissolve lacquers. Relatively milder and slower-acting, mineral spirits–based paint thinner is mainly effective on wet coatings. Paint thinner can damage cured coatings—but not with the speed and strength that lacquer thinner can.
Safety and Environmental Concerns
Both lacquer thinner and paint thinner are considered hazardous. Wear chemical-resistant goggles and gloves and breathing protection when working with either product. Work with these products only in well-ventilated areas. Volatile organic compounds (VOCs) are gasses that are emitted by chemicals, including lacquer thinner and paint thinner. VOCs have negative health effects, both immediately and in the long-term. Both products produce VOCs, but lacquer thinner produces less than paint thinner.
