Safely store leftover paint (or dispose of it properly)

Leftover paint is useful for two years of touch-ups — if you store it right. Most people don’t, then end up with a thick skin floating on a separated mess.

Store it properly

1. Wipe the rim clean before closing. Paint drying in the seal makes the lid impossible to remove later.
2. Cover the surface with plastic wrap before sealing — keeps air off the paint surface.
3. Tap the lid down evenly with a rubber mallet (or a wooden hammer handle). Don’t strike one spot — you’ll dent the rim.
4. Store upside down. Air rises, paint sits below, the seal is at the bottom = no skin forms on top.
5. Cool, dark, dry place. Not the garage (temperature swings), not under the sink (moisture). A spare cupboard at room temperature.
6. Label clearly with: paint name, room used in, date opened. A small adhesive label on the lid (not the side — gets scratched).

How long does it last?

• Latex/water-based, properly sealed: 2 years.
• Oil-based, properly sealed: 10+ years.
• Loose lid or contaminated: weeks.

Check before reusing

1. Open and smell. Sour/rancid = bin it.
2. Stir for 2 minutes with a stirring stick. If it lumps or won’t smoothen, bin it.
3. Brush a sample on a piece of cardboard. If it flakes or doesn’t level, bin it.

Dispose of bad paint properly

Never pour paint down the drain — even latex. It contaminates water supplies. Two methods:

1. Solidify and bin: pour into a cardboard box filled with cat litter or sawdust. Let solidify fully (24-48 hours). Then bin in regular waste.
2. Hazardous waste drop-off: every municipality has one. In France: your local déchetterie. Oil-based and solvent-based paint must go through this route — they cannot go in regular waste.

See our Chemical Safety page for more detail.