The Complete Guide to Using Mineral Spirits on Wood Furniture

Mineral spirits, also known as white spirits or turpentine (in the Netherlands), are a colourless, flammable, transparent liquid derived from the distillation of petroleum. Their primary purpose is to thin oil-based paints, varnishes, and finishes and to clean and degrease surfaces, including wood. Mineral spirits are key in woodworking and furniture refinishing, making them a must-have for any workshop.

When refinishing furniture or preparing a wooden surface, mineral spirits are your go-to product. Few cleaning products can match their efficiency in dissolving oils, greases, and waxes. While standard cleaners can make a difference, mineral spirits offer the deep clean necessary to properly prepare wood for finishing.

Benefits of Using Mineral Spirits on Wood

Mineral spirits offer numerous advantages for woodworking and furniture refinishing. Beyond cleaning, they serve several critical roles in preparation and finishing. Let’s break down why mineral spirits are the MVP in any refinishing workshop.

Mineral Spirits as a Degreaser

Mineral spirits excel at removing grease, oil, and grime that other cleaners can’t touch. This solvent effectively dissolves oily residues, making it easy to clean wood surfaces. Simple dish soap won’t effectively clean waxed wood surfaces, but mineral spirits will.

For years of wax accumulation, let a cloth soaked in mineral spirits sit on the surface for a few minutes before scrubbing with fine steel wool, dipped in spirits. This will cause the wax to loosen and be scrubbed up with the wool.

However, if you plan to use water or water-based products at any point in the process, switch to a plastic scrub pad (such as Scotch-Brite) to avoid black spots caused by wood tannins interacting with the steel and water. You will also need to remove any mineral spirit residue, which I will share below.

Check out this indepth information on other types of cleaners. 

Wipe Away Dust Without Raising the Wood Grain

Water can raise wood grain by swelling the wood fibres. This does not occur with mineral spirits, which evaporate without soaking into the wood. This means they won’t swell the wood fibres or raise the grain as water does. If you’ve finished sanding a piece and need to remove dust while keeping the surface smooth, mineral spirits are one option. I explain the full preparation process in my guide on cleaning wood after sanding before applying a finish.

Highlight Wood Grain and View the True Colours

Mineral spirits can temporarily reveal the true beauty of the wood grain. Unlike water, which doesn’t clearly show the colour and grain pattern, mineral spirits give you a preview of how the wood will look with an oil finish.

This ability to see how the wood grain will look with an oil finish is an invaluable tool. For example, you can wipe on mineral spirits to check for colour differentiation between a piece of new veneer and the original veneer, allowing you to colour-match successfully before applying your final finish.

Use Mineral Spirits After Stripping the Wood Surface

After using a chemical stripper to remove an old finish, it is essential to clean the surface thoroughly before sanding or refinishing. Again, Mineral spirits are ideal for this step, helping dissolve any leftover stripper residue and ensuring a clean, smooth surface.

Simply soak a piece of fine steel wool or a clean cloth in mineral spirits to scrub away any remaining paint clumps, debris, wax, or finish remnants.

Improve Your Wood Staining with Mineral Spirits

Applying mineral spirits before staining with an oil-based stain can help achieve a more even and professional result. Mineral spirits open the grain and remove any lingering dust or oils, improving the absorption of oil-based stains.

Furthermore, you can thin your oil-based stains with mineral spirits to create a more subtle, controlled finish, making it easier to achieve a custom look.

How to Clean Oil Brushes with Mineral Spirits

While I love the easy clean-up ability of water-based products, cleaning oil-based products isn’t that hard when you know this method.

After using any oil-based paints or stains, Mineral spirits will be your friend.  

Here’s how to clean oil brushes with mineral spirits:

1. Prepare a cleaning jar: Pour enough mineral spirits into a jar to cover the bristles of your brush. I save glass jars (like jam jars for this purpose).

2. Dip the brush: Swirl the brush in mineral spirits for several minutes. The mineral spirits should cover the bristles but not go further than that. Or, be lazy like me, toss the brush in, and leave it while you are busy elsewhere.

3. Wipe and rinse: Once most of the paint has dissolved, wipe the brush with a clean rag or paper towel. If there’s still residue, you may need to repeat this step.

4. Wash with soap and water: After cleaning with mineral spirits, wash the brush with warm, soapy water to remove any remaining spirit and residue.

5. Dry thoroughly: Once clean, shake the brush to remove excess water, reshape the bristles, and allow it to dry completely before storing. I like to hang my brushes and bristle down so no water or residue dries by the base.

TIP Put a lid on your jar and save for multiple uses. The mineral spirits will separate from the paint and can be poured off for another time.

How to Clean Mineral Spirits Off Wood for Water-Based Finishes

If you decide to use a water-based finish or stain, mineral spirits are not your friend. Any residue from the mineral spirits could cause your water-based product to adhere incorrectly. If you plan on using water-based products, reconsider using mineral spirits. But what if you changed your mind mid-project and are now worried about adhesion?

In that case, removing residual mineral spirits from the wood surface is crucial. Here’s how to clean mineral spirits off wood before applying water-based finishes:

1. Soap and water: Wash the wood surface with mild dish soap and water. This will help remove any remaining solvent from the surface.

2. Rinse and dry: Wipe the wood down with a clean, damp cloth to remove any soap residue. Better yet, wipe down once with clear water. Then, allow the wood to dry thoroughly.

3. Light sanding: Once dry, lightly sand the surface with fine-grit sandpaper because water can raise the wood grain. This will smooth the surface and prepare it for the water-based finish. When I say fine grit, I am talking just 180 or 240. You simply want to remove any raised wood fibres.

4. Use a tack cloth: After sanding, use a tack cloth to remove any remaining dust.

If you prefer to avoid mineral spirits entirely when using water-based products, skip the solvent and clean dust with a tack cloth between sanding steps.

How to Apply Mineral Spirits to Wood

To get the best results with mineral spirits, proper application is key. Never pour spirits directly onto the wood surface. Instead, follow these steps:

1. Use a lint-free cloth: Soak a clean cloth in mineral spirits and wipe it liberally over the entire area.

2. Let it sit: Allow the mineral spirits to sit for 5–10 minutes to penetrate and dissolve grease, grime, or residue. Or, if you simply want to see the look of the wood grain, wipe the surface quickly without leaving the spirits to sit. This will show you the grain.

3. Wipe again: After it sits, wipe the surface with a clean cloth to remove any loosened debris and excess solvent.

4. Dry thoroughly: Make sure the wood dries completely before applying any finishes. Rushing this step can cause issues with finish adhesion.

Safety Precautions for Using Mineral Spirits

Always handle mineral spirits carefully due to their flammability and potential health risks from inhalation. Ensure you’re working in a well-ventilated area, and avoid any open flames or sparks.

• Wear gloves and eye protection to prevent skin or eye contact with the solvent.

• Store rags and waste materials in approved flammable containers to prevent accidental ignition.

• Wear a Respirator to protect your lungs 

How to Properly Dispose of Used Mineral Spirits

Mineral spirits must be disposed of responsibly for both safety and environmental protection. Allow rags with mineral spirits to dry completely before discarding them with regular rubbish. Store any remaining solvent in a sealed, leak-proof container and take it to a hazardous waste facility for proper disposal.

Final Thoughts

Mineral spirits are indispensable for anyone serious about woodworking or furniture refinishing. They are a key component of your workshop, but understanding how they work and interact with different products is key to ensuring a final finish you are happy with. Don’t use mineral spirits on wood if you plan on refinishing with water-based products. Your final finish may fail. You can also avoid this by taking an extra step to clean any mineral spirits residue off of your project before applying your water product.

Proper handling is important when handling chemicals in your workshop to protect yourself and your environment. So, always follow safety protocols and dispose of any waste correctly.