Three 'Paint Gard 4-Packs' (protects 12 One-gallon cans of paint) Extend leftover paint life for years (one per gallon-sized can) Protects paint inside a poorly sealed container and from air trapped in can Prevents skin forming on top of paint - floats on top of the paint like a SECOND LID! Doubles as a handy palette for touch-ups Inexpensive and reusable