The primary aim of correct paint storage is minimising air exposure. When rogue air infiltrates a paint can, the paint will dry out very quickly.

To prevent this, simply store your paint cans upside down. The paint will create its own seal against the lid, protecting it from outside air.

Clean around the can rim and lid before sealing and store paint in an area where the temperature will not vary too wildly as hot and cold flactuations can also affect the lifespan of leftover paint.