Solvent storage is the least glamorous part of an oil painting setup, and it is the part most likely to cause a real problem. A bottle left by a sunny window, a jar of rinse spirits uncapped all week, or a box of oily rags tucked under a desk are everyday studio scenes that can turn into health or fire hazards. Learning how to store odorless mineral spirits properly takes ten minutes and a couple of inexpensive containers.
Quick answer: Store odorless mineral spirits in its original container or a clearly labeled metal or glass solvent container with a tight-fitting lid. Keep it in a cool, dry, ventilated place away from sunlight, heaters, pilot lights, sparks and flames, and out of reach of children and pets. Keep only small quantities in the studio, close containers between uses, and never store it in food or drink containers.
Why Storage Matters for a “Low-Odor” Solvent
Odorless mineral spirits has had most of its smelly aromatic compounds removed, but it is still a petroleum solvent. Three properties drive every storage rule:
- It is flammable. The vapor can ignite if it meets a flame, spark or hot surface.
- It evaporates. An open or poorly sealed container steadily releases vapor into the room, and you will not smell it.
- It can be harmful if swallowed or inhaled in quantity. Clear, odorless liquids are easy to mistake for water.
Good storage limits all three: it keeps vapor in the container, keeps ignition sources away and keeps the liquid where nobody will confuse it with something else. It also starts with the product itself; a well-refined artist-grade odorless mineral spirits keeps aromatic content low, which matters when the bottle lives indoors.
Choosing the Right Container
| Container | Suitable? | Notes |
|---|---|---|
| Original manufacturer’s bottle or can | Best | Designed for the product, carries the label and safety information |
| Metal solvent can with screw cap | Very good | Durable, opaque, does not degrade; ideal for larger amounts |
| Glass jar with tight lid | Good for small working amounts | Lets you see contents; can break if dropped, so keep it low and stable |
| Purpose-made brush washer with sealed lid | Good for in-use solvent | Choose one with a lid that closes tightly |
| Thin plastic tubs, water bottles, food jars | Avoid | May soften or leak over time; risk of being mistaken for a drink |
| Open cups or unlidded jars | Avoid | Constant evaporation into the room |
Some sturdy plastic bottles are made for solvents and are fine, which is why many commercial OMS products come in plastic. The problem is reusing random plastic containers that were never intended for solvents.
Where to Store Odorless Mineral Spirits
Good locations
- A closed cabinet or cupboard in a cool room, away from the kitchen and bedrooms if possible.
- A dedicated metal cabinet for flammable materials if you keep larger quantities.
- A detached garage or shed that does not get very hot, with containers kept off the floor and away from fuel-burning equipment.
Locations to avoid
- Windowsills or anywhere in direct sunlight, which warms the liquid and increases pressure and vapor.
- Near furnaces, water heaters, boilers, dryers or anything with a pilot light or open flame.
- Next to space heaters, radiators, hot lamps or electrical equipment that can spark.
- Bedrooms and enclosed living spaces, where vapor can accumulate where people sleep.
- Low, open shelves where children or pets can reach.
- Hot cars and uninsulated attics.
How to Store Odorless Mineral Spirits: Step by Step
- Keep the original bottle as your main supply. Store it closed in your chosen cupboard, and only take it out to refill a working jar.
- Decant a small working amount. Pour a few ounces into a labeled glass jar or brush washer with a tight lid for each painting period.
- Label everything. Use waterproof tape and a marker: “Odorless mineral spirits, flammable.” Include “dirty” or “clean” for reclaimed jars.
- Close the working jar between uses. Even during a session, cap it when you are not actively rinsing.
- Wipe container necks. Paint or dried medium on the threads can prevent a lid from sealing.
- Return everything to storage after painting. Do not leave solvent on the easel tray overnight.
- Store upright. Upright containers are less likely to leak through imperfect caps.
- Check containers periodically. Look for leaks, swelling, rust on metal cans or cracks in glass.
How Much Solvent to Keep on Hand
The safest quantity is the smallest one that keeps you painting. A typical home studio needs very little:
| Studio Type | Working Jar | Stored Supply |
|---|---|---|
| Occasional painter | 2 to 4 oz | One 16 oz bottle |
| Weekly painter | 4 to 8 oz | One 32 oz bottle |
| Daily or teaching studio | 8 oz per station, lidded | Up to a gallon, in a metal can or flammables cabinet |
Buying in bulk saves money per ounce but means storing more flammable liquid at home. If you reclaim used solvent by settling, you will need much less new solvent than you expect.
Storing Used and Reclaimed Solvent
Dirty spirits needs the same care as fresh, plus a little more labeling.
- Keep dirty solvent in a sealed jar marked “dirty – settling” with the date.
- Place it where it will not be disturbed so pigment can settle to the bottom.
- After settling, decant clear spirits into a second labeled jar marked “reclaimed.”
- Keep sludge sealed until you dispose of it at a household hazardous waste collection point.
- Never combine different solvents, such as turpentine and OMS, in the same reclaim jar.
Fresh solvent is best reserved for thinning paint and mixing mediums, while reclaimed spirits handles brush rinsing. Our comparison of the best odorless mineral spirits for oil painting can help you choose a clean, low-odor bottle for that fresh supply.
Oily Rags: The Storage Problem People Forget
Mineral spirits evaporates, but the linseed and other drying oils it removes from brushes do not. Rags, paper towels and sponges soaked with oil paint and medium can heat up as the oil oxidizes and, in a crumpled pile, can reach ignition temperature on their own. This is a documented cause of fires in studios and workshops.
- Option 1: Lay rags flat, unfolded, outdoors on a non-flammable surface until fully dry and stiff, then dispose of them.
- Option 2: Place them in a metal container with a tight lid, filled with water, until you can dispose of them according to local rules.
- Option 3: Use a purpose-made oily waste can with a self-closing lid.
Never leave oily rags balled up in a wastebasket, a plastic bag or a pile in a corner.
Setting Up a Small Solvent Station
A tidy, consistent setup makes good storage automatic rather than something you have to remember. A simple station for a home studio might look like this:
- A metal tray or shallow pan on a low, stable shelf or table, to catch drips and contain small spills.
- One lidded brush washer or jar for the current session’s rinse solvent.
- One sealed, labeled settling jar for dirty solvent waiting to clear.
- One sealed, labeled jar of reclaimed spirits for refilling the rinse jar.
- A lidded metal can for oily rags, half-filled with water, or a dedicated oily waste can.
- Nitrile gloves and a roll of paper towels within reach, so you are not walking solvent-soaked brushes around the room.
Keep the station away from your heat source and close to a window if possible. The main bottle of fresh solvent stays in a separate closed cupboard and only comes out for refills.
What to Do About Spills
Small spills happen. Wipe them up immediately with paper towels, then treat those towels like oily rags: lay them flat outdoors to dry or place them in the water-filled metal can. Open windows to clear vapor. For a larger spill, ventilate the area well, keep all ignition sources away and absorb the liquid with an inert material such as cat litter before collecting it for hazardous waste disposal.
Temperature and Shelf Life
Odorless mineral spirits does not spoil the way linseed oil can, and a sealed container stored properly can last for years. What does happen over time is evaporation through imperfect seals and contamination from dust, water or pigment if containers are opened often.
Heat is the bigger concern. Warm liquid gives off more vapor and builds pressure in sealed containers. Room temperature or cooler is ideal. Freezing is not a typical problem in normal indoor or garage conditions, but avoid storing it anywhere with extreme temperature swings.
Storing Solvent in Small Spaces and Apartments
Many painters work in a corner of an apartment, which makes storage choices more important.
- Keep only a single small bottle and one lidded working jar.
- Store them in a closed cabinet away from the kitchen stove and any gas appliances.
- Use a brush washer with a tight-sealing lid rather than an open jar.
- Paint near a window that opens, and keep solvent use to brief rinses.
- Consider a solvent-free approach: clean brushes with oil and soap, and use solvent-free mediums. This removes the storage question entirely.
Transporting Solvent for Plein Air or Classes
Carrying solvent to a workshop or painting location needs a few precautions.
- Use a small, leak-proof metal or solvent-rated container with a screw cap.
- Fill it only partway to allow for expansion if it warms up.
- Place it upright in a sealed bag or box inside your kit.
- Do not leave it in a hot car for long periods.
- Check local rules before attempting to fly with solvent; most airlines restrict flammable liquids, and many painters buy solvent at their destination instead.
Common Storage Mistakes
- Using a water bottle or jam jar without a label. Clear solvent looks like water.
- Leaving the working jar open all session. Vapor builds up even when you cannot smell it.
- Storing next to a water heater or furnace. Pilot lights and burners are ignition sources.
- Buying large quantities you will not use soon. More solvent at home means more risk.
- Stuffing oily rags into a trash can. This is the most serious fire risk in an oil studio.
- Keeping solvent in a bedroom studio. Vapor and sleep spaces are a poor mix.
Disposal When You Are Done
If you are moving, stopping oil painting or clearing out old supplies, do not pour solvent down drains, into the ground or into the trash. Take unused or dirty mineral spirits to a household hazardous waste program. Many local governments run drop-off sites or collection days, and some paint retailers have take-back programs. Check your local rules for what they accept.
A Simple Storage Checklist
- Original or labeled solvent-rated container with a tight lid.
- Stored upright in a closed cabinet, in a cool, ventilated area.
- Away from sunlight, heat sources, pilot lights and sparks.
- Out of reach of children and pets.
- Small working jar only; main bottle stays in storage.
- Oily rags dried flat outdoors or kept in a water-filled sealed metal can.
- Dirty and reclaimed solvent labeled and dated.
FAQs
Can you store odorless mineral spirits in a plastic container?
Only in a plastic container designed for solvents, such as the original bottle. Thin food or drink containers can soften, leak or be mistaken for something drinkable.
Can odorless mineral spirits go bad?
It does not spoil in the usual sense. Properly sealed, it can last for years. It can become contaminated with dust, water or pigment, or partly evaporate if the container leaks.
Is it safe to store mineral spirits in a garage?
It can be, if the garage does not get very hot and the solvent is kept away from cars, furnaces, water heaters, gas-powered tools and any open flame or spark source.
How should I store a jar of dirty mineral spirits?
Seal it tightly, label it with the contents and date, and keep it still in a cool cupboard so the pigment can settle. Decant the clear spirits off the top later for reuse.
Can I leave mineral spirits in my brush washer overnight?
Yes, if the brush washer has a tight-sealing lid and is stored away from heat and flames. An open container should not be left out overnight.
What temperature should mineral spirits be stored at?
Room temperature or cooler, away from direct sunlight and heat sources. Warm conditions increase vapor and pressure inside the container.
Final Thoughts
Store odorless mineral spirits the way you would store any flammable household liquid. Use a sealed, labeled container in a cool cupboard, keep small amounts in use, and keep it well away from heat, children and oily rag piles. Those habits make solvent use a non-issue in most home studios. When it is time to restock, start with a quality low-odor bottle; our guide to odorless mineral spirits worth buying compares artist-grade options.
