Quick answer: To store acrylic paint properly, keep tubes, bottles and jars tightly sealed with clean threads, store them indoors at moderate room temperature (roughly 60 to 75°F is ideal) away from direct sunlight, and never let them freeze or bake. Squeeze air out of tubes, store squeeze bottles so paint stays near the opening, and keep mixed colors in small airtight containers or a lidded wet palette. Discard paint that smells sour or shows mold.
Acrylic paint is tough once it dries on canvas, but in the tube it is a water-based emulsion that is surprisingly easy to spoil. Air dries it, freezing breaks it, heat thickens it and bacteria can turn it rancid. Learning how to store acrylic paint properly protects your money and keeps colors behaving the way they did on the day you bought them. If you also need racks or drawers, our acrylic paint storage roundup covers the hardware side.
This guide covers the ideal storage conditions, container-by-container instructions, how to save mixed colors, organization ideas, warning signs of bad paint and how to rescue paint that has started to thicken.
Why Acrylic Paint Goes Bad
Acrylic paint is pigment suspended in an acrylic polymer emulsion, essentially tiny plastic particles floating in water with additives. Each storage problem attacks a different part of that mix:
- Air exposure lets water evaporate, so polymer particles fuse and the paint thickens or hardens.
- Freezing can disrupt the emulsion. After repeated freeze-thaw cycles, paint may turn grainy, stringy or cottage-cheese-like.
- Heat speeds evaporation and can make paint gummy or cause it to skin inside the container.
- Bacteria and mold can grow if paint is contaminated with dirty water or brushes, leading to sour smells and fuzzy spots.
- Light matters less inside opaque tubes, but heat from sunlight can still harm paint in clear jars.
How Should Paint Be Stored? The Ideal Conditions
| Condition | Ideal | Avoid |
|---|---|---|
| Temperature | Moderate room temperature, roughly 60–75°F | Freezing temperatures and anything hot, such as a car or attic in summer |
| Temperature stability | Steady, indoor climate | Big daily swings, such as an uninsulated garage |
| Light | Dark or indirect light | Sunny windowsills |
| Humidity | Normal indoor humidity | Damp basements, which can rust caps and encourage mold |
| Air | Tightly sealed containers | Loose caps, cracked lids, crusty threads |
Manufacturers’ exact recommendations vary, so check the label or the brand’s website if you are storing expensive professional paint for a long time.
How to Store Acrylic Paint Properly by Container Type
Tubes
- Clean the threads and cap with a damp paper towel before closing. Dried paint in the threads stops the cap sealing and can glue it shut.
- Squeeze from the bottom and roll or flatten the empty end so air does not collect inside.
- Close firmly but do not overtighten plastic caps, which can crack.
- Store flat or cap-down in a drawer or bin. Many painters store tubes horizontally so they don’t bend at the shoulder; others keep them cap-down so paint stays near the opening. Either works if the cap seals well.
If a cap is stuck, soak the cap end in warm water for a minute or two, or hold it briefly under warm running water, then grip it with a rubber jar opener.
Squeeze bottles (craft and fluid acrylics)
- Wipe the nozzle before closing so paint doesn’t harden in the tip.
- Snap or twist the cap fully closed. Flip caps that don’t click shut let paint dry quickly.
- Store upside down in a rack or on a shelf with a lip if the bottle design allows. Paint stays near the opening, so it flows immediately and air sits at the bottom of the bottle instead of at the nozzle.
- Clear clogged tips with a straightened paper clip or pin, then wipe.
Jars and tubs (heavy body, gesso, mediums)
- Scrape the rim and threads clean before closing.
- Lay plastic wrap over the opening before screwing the lid on for an extra seal.
- Use a clean palette knife to scoop paint. Dirty tools and brushes introduce bacteria.
- Store upright so paint does not sit against the lid.
- Transfer the last bit of a large jar into a smaller airtight container so there is less air above it.
Spray and acrylic markers
Store acrylic paint markers horizontally with caps firmly on, unless the packaging says otherwise. Keep any aerosol acrylic paint cool and upright, away from heat and flame, following label warnings.
How to Store Mixed Acrylic Paint
Mixing a perfect custom color and then losing it to drying is frustrating. These methods help:
| Method | How long it can keep | Best for |
|---|---|---|
| Lidded wet palette | Days, sometimes longer | Ongoing paintings, small amounts |
| Small airtight containers (cosmetic jars, film canisters, mini deli cups) | Weeks to months if well sealed | Custom colors you’ll reuse |
| Plastic wrap over a palette | Hours to a day | Short breaks |
| Wet palette in the fridge | Can extend freshness and slow mold | Warm climates, long projects |
Fill small containers close to the top to reduce trapped air, and label each with the color mix and date. Masking tape and a marker work fine. A few drops of water misted on top before sealing can help in dry climates, but too much water dilutes the binder and encourages mold, so keep it minimal.
Paint Can Storage Ideas and Organizing Your Supply
Good organization is part of proper storage, because paint you cannot find tends to get bought twice or forgotten until it spoils.
- Shallow drawers or flat bins for tubes, sorted by color family or by brand.
- Tiered spinning racks or wall racks for craft bottles, ideally holding them upside down.
- Clear, lidded plastic boxes labeled by type: heavy body, fluid, craft, mediums.
- Pegboard with shelves above a work table to keep everyday colors within reach.
- A dedicated cart on wheels for small spaces, which can be rolled into a closet out of the sun.
- First in, first out: place newer paint behind older paint so you use up the oldest first.
For a comparison of racks, carts and organizers sized for different collections, see our guide to the best paint storage for acrylic organizing.
Can You Store Paint Outside?
It is best not to. Sheds, garages, porches and cars often swing between freezing and very hot, which is exactly what acrylic emulsions handle poorly. A single hard freeze can ruin a bottle, and a summer car interior can turn paint gummy.
If an outbuilding is your only option, choose one that is insulated or climate-controlled, keep paint in a closed cabinet off the floor, and bring it indoors during cold snaps and heat waves.
How to Store Paint Safely
Acrylics are generally among the lower-hazard art paints, but safe storage still matters:
- Keep paint, mediums and cleaners out of reach of young children and pets.
- Store artist paints away from food and drink, especially pigments with cautionary labels such as some cadmium or cobalt colors.
- Keep labels intact so you know what each product is and any warnings it carries.
- Store any solvents or spray products separately in a cool, ventilated area, following the label.
How Long Does Acrylic Paint Last in Storage?
Well-sealed acrylic paint stored in good conditions can remain usable for years. Many artists use tubes that are several years old without trouble. Shelf life shrinks quickly with poor seals, frequent temperature swings, contamination or partially used jars with lots of air inside. Rather than relying on a date, check condition before use.
Signs Your Acrylic Paint Has Gone Bad
| Sign | Likely cause | Usable? |
|---|---|---|
| Thicker than normal but smooth | Some water loss | Usually; see revival tips |
| Liquid separated on top | Normal settling | Usually; stir or knead well |
| Rubbery lumps or skin | Partial drying | Remove the lumps; use the rest if smooth |
| Grainy, stringy or curdled | Freezing or age | Often not; test on scrap |
| Sour, rotten-egg or ammonia-like smell | Bacterial contamination | Discard |
| Fuzzy spots or colored growth | Mold | Discard; clean any tools that touched it |
| Fully hard | Completely dried | No |
Keep in mind that a light ammonia smell can be normal in some fresh acrylics because ammonia is used in certain formulations. A smell that is clearly rotten or sour is the warning sign.
How to Revive Thickened Acrylic Paint
- Knead tubes between your fingers for a minute to redistribute separated binder.
- Stir jars and bottles thoroughly with a clean stick or palette knife.
- Add a little water, a few drops at a time, and mix well. Too much water weakens the paint film.
- Better yet, add a fluid acrylic medium or flow improver, which thins without diluting the binder.
- Strain out lumps through an old nylon stocking if the paint is fluid enough.
Fully hardened acrylic cannot be turned back into paint. Some artists cut dried paint into pieces for collage or texture, but it will not dissolve again.
How to Properly Store Paint Between Sessions
Day-to-day habits prevent most problems:
- Squeeze out only what you need for the session.
- Recap tubes and bottles immediately after each use, not at the end of the session.
- Never return used palette paint to the original container; it may carry contaminants.
- Keep a damp paper towel handy to wipe threads as you go.
- Cover your palette with a lid or plastic wrap during breaks.
Storage Setups by Collection Size
| Collection | Simple setup | What to watch |
|---|---|---|
| Starter set (12–24 tubes) | One lidded box or a single shallow drawer | Keep it out of sunny rooms and cars |
| Hobby collection (30–80 tubes or bottles) | Divided drawers or a rolling cart, sorted by color | Rotate stock so older paint gets used first |
| Craft bottle collection (100+) | Wall rack or tiered rack holding bottles upside down | Wipe nozzles; check for clogged tips monthly |
| Mixed media studio | Labeled bins by paint type plus a separate shelf for mediums and gesso | Keep heavy jars on low shelves |
Transporting and Moving Acrylic Paint
Paint is most at risk during workshops, trips and house moves. Pack tubes and bottles in a sealed plastic bag or lidded box in case a cap pops. Keep the box in the passenger area of the car rather than the trunk during very hot or cold weather, and never leave it in a parked car. For moves in winter, carry paint yourself rather than letting it ride in an unheated moving truck. When you arrive, let paint sit at room temperature for a few hours before opening, then stir or knead it before use.
Common Storage Mistakes
- Leaving paint in a car or garage through winter or summer.
- Dipping brushes directly into jars, which introduces water and bacteria.
- Storing near heaters, radiators or sunny windows.
- Ignoring crusty caps, which slowly let air in.
- Keeping a big half-empty jar instead of transferring the remainder to a smaller container.
FAQs
Should acrylic paint be stored upside down?
Squeeze bottles often benefit from upside-down storage so paint stays near the nozzle. Tubes can be stored flat or cap-down. Jars should stay upright.
Can acrylic paint freeze and still be used?
Sometimes. Let it thaw slowly at room temperature and stir well. If it stays grainy, stringy or curdled, its quality is compromised and it may not adhere properly.
Can you store acrylic paint in the fridge?
A wet palette or small containers of mixed paint can go in the fridge to slow drying and mold. Do not let paint freeze, and keep art materials separate from food.
How do you store acrylic paint long term?
Seal containers tightly with clean threads, reduce air space, and keep them indoors at a steady moderate temperature away from sunlight. Check them every few months.
Why does my acrylic paint smell bad?
A sour or rotten smell usually means bacterial contamination, often from dirty brushes or water. Discard the paint and clean anything that touched it.
Is it okay to store paint in a garage?
Only if the garage stays above freezing and does not get very hot. Uninsulated garages are generally a poor place for acrylics.
Final Thoughts
Storing acrylic paint well comes down to three habits: seal it tight, keep it at a steady room temperature, and keep it clean. Add a sensible organization system and your paint will stay usable far longer, saving you money and frustration. If your collection has outgrown drawers and shoeboxes, explore our top acrylic paint organizers and storage picks to find a setup that protects your paints and fits your space.
