Prepare the paint for storage: Label the paint can lid with the color and the location where the paint was used.
To properly store your paint, make sure you tightly seal the can. First, wipe away any excess paint from the rim. Then cover the can opening with plastic wrap. Put the lid securely in place and tap it down with a mallet. Store the can upside down. If the can is leaking, place it in a leak-proof container.
Store paint where temperatures are moderate. Temperature extremes can negatively affect paint and make it unusable. Never allow paint to freeze.
Quick-reference your stored cans by brushing a small amount of paint onto the outside surface (body of can or lid) and writing the color name and number in permanent ink. You can also identify the room or wall that was painted with that color.
You may also want to create and save a file on your computer of the paints you have placed in storage; that way, if someone tosses it by mistake you still have the information at your fingertips.
Keep paint in a safe location, away from children and pets.