How to Dispose of Paint the Right Way

Whether you're updating your walls with a fresh color or revamping an old piece of furniture, it can be difficult to know exactly how much paint you'll need. Even if you calculated carefully to purchase precisely the right amount, there's a good chance you'll still have some leftover paint after finishing your home painting projects. Those partially empty paint cans can't simply be tossed into the garbage, so learning how to dispose of paint properly is important.

Make sure you're not throwing away liquid paint, which could allow toxic chemicals to contaminate the environment. Some states and municipalities have specific rules about paint disposal, so check before you begin. If you have paint leftover from past projects, some of which might have been sitting around for a long time, follow these guidelines on how to dispose of latex and oil-based paint.

Related: Types of Paint: A Guide to Paint Finishes and Surfaces

How to Dispose of Paint That's Gone Bad

The good news is, paint lasts long when properly stored indoors, away from temperature extremes, and with the lid securely in place. In fact, latex paint can last up to 10 years when stored properly, and oil-based (or alkyd) paint can remain usable for up to 15 years.

So before you get rid of old paint, pop the lid and take a whiff. If it just smells like paint, it's likely still usable. If it smells rotten, it's best to dispose of the paint. Another way to tell if the paint is still usable is to check whether dried chunks or layers are at the bottom or sides of the can. Remove any skin that formed on the top and give the paint a stir. Brush out a sample onto a scrap piece of cardboard and see if the color is right and glides on smoothly.

Related: How Long Does Paint Last? 6 Signs It’s Time to Toss

How to Donate Paint

If everything looks (and smells) good, consider donating the paint to an organization that can use or resell it. Some options include schools, community theaters, shelters, or Habitat for Humanity ReStore. Always call ahead and check to make sure it's needed before dropping it off and to get the organization's guidelines for what's acceptable. To find a retail store near you to drop off leftover paint, PaintCare has a search option to find a location in your area. Locations accept all kinds of paint and will take lacquers, shellacs, and other surface treatments as well but may have requirements for how much paint is left in the can.

If you have large quantities of usable paint, consider posting on sites like Facebook Marketplace or Craigslist to see if someone in your community is interested. There are many creative ways to use leftover paint for new projects that you might want to consider, too.

How to Dispose of Latex Paint

Most waste collection companies request that only solidified latex paint be thrown into the garbage and taken to landfills. If only a small amount of latex paint is left in the can, remove the lid and let it air dry. An alternate way to dispose of paint is to pour it onto a newspaper-covered surface and let it dry. Throw the newspaper, dried paint, and can into the garbage for pickup.

To dry larger quantities of paint, add cat litter or shredded newspaper to the paint, stir, and let it air dry inside the can. If there's one inch or less in the can, it will take a few days for the paint to fully dry. Throw the can and its dried contents into the garbage for regular pickup. You can also purchase paint hardener, available at many home improvement stores, for a few dollars. Add it to the paint (up to ? of a gallon), allow it to harden, and throw it all in the trash.

How to Dispose of Oil-Base Paint

Oil- and alkyd-based paints are considered hazardous waste. When disposed of improperly, they could harm sources of drinking water. So rather than throw oil- or alkyd-base paints in the regular garbage, call your local waste authority to find out how to dispose of oil-based paints. You'll usually take the expired paints to a local hazardous waste drop-off site. Or you can leave it on the curb during your community's hazardous waste collection day.

Related: The 9 Best Paints for Cabinets That Look Factory Finished

How to Properly Store Paint

To help latex and oil-base paints keep for many years, put plastic wrap across the top of the can opening and replace the lid, ensuring a tight seal with a few taps from a rubber mallet. Turn the paint can upside down to create a strong seal and store it on a shelf where temperatures remain moderate and steady.

Frequently asked Questions

How long does it take for a can of paint to dry out?

It depends on the type of paint and the size of the can. If you leave the lid off, then the paint can completely dry up in a few days. However, paint can last between 2-15 years if it is fully sealed in its container.

Can you use old paint that has separated?

Possibly, but you need to stir it first in order to make sure the color is consistent and smooth. You should also wait a few minutes after stirring to see whether the paint continues to separate, in which case, it is unusable.

Is latex paint flammable?

Generally, latex paint is safe. Since it is water-based, it is not nearly as flammable as oil-based paints.

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