Does Paint expire?
Does Paint expire?
Unopened water-based paint keeps a few years; opened tins depend entirely on how well they were sealed.
Unopened emulsion: 2-5 years. Unopened solvent-based: up to 10. Opened: 1-2 years if properly sealed
Water-based paint is an emulsion, and what kills it is either freezing — which breaks the emulsion irreversibly — or the water evaporating past a partly sealed lid. Solvent-based paint lasts longer unopened but skins over quickly once air is in the tin. A skin on the surface is not itself failure: cut round it, lift it off and check what is underneath. Paint that has separated will usually recombine with thorough stirring, but paint that smells sour or rancid has grown bacteria and will not.
How to store it
- Seal the lid by tapping round the rim, and store the tin upside down so the paint itself makes the seal.
- Never let emulsion freeze. A garage in a cold winter destroys more paint than time does.
How to tell it has gone
- Sour or rancid smell means bacterial growth — discard.
- Lumpy, cottage-cheese texture that will not stir out means the emulsion has broken.
"Use by" and "best before" are legally different. Use-by is a safety date and should be respected; best-before is about quality, and food is usually fine well past it. Where the two diverge matters, the page above says which applies.
Common questions
- Does Paint expire?
- Unopened water-based paint keeps a few years; opened tins depend entirely on how well they were sealed.
- How long does Paint last?
- Unopened emulsion: 2-5 years. Unopened solvent-based: up to 10. Opened: 1-2 years if properly sealed
Related pages
- Does Eggs expire? Eggs stay usable for weeks past the date on the box, and the float test tells you about age rather than safety.
- Does Medicines expire? Most solid medicines keep much of their potency for years past the date — but a handful genuinely must not be used late.
- Does Petrol and diesel expire? Petrol goes stale within months, and ethanol blends go faster because they absorb water.
- Does Batteries expire? They self-discharge on the shelf, at very different rates by chemistry — and alkalines leak when flat.
- Does Wine expire? The great majority of wine is meant to be drunk within a year or two. Very little of it improves.
- Does Chocolate expire? It keeps far longer than the date. The white bloom on old chocolate is fat or sugar, not mould.
- Does Household bleach expire? It loses strength within months and eventually becomes salt water. This surprises most people.
- Does Flour expire? White flour keeps 6-12 months; wholemeal goes rancid in 3-6 because the wheat germ oil oxidises.
- Does Honey expire? Does not expire
- Does Milk expire? Has a real expiry date
- Does Sunscreen expire? Unsafe or ineffective after the date
- Does Salt expire? Does not expire
- Does Frozen food expire? Indefinite if stored properly
- Does Canned food expire? Indefinite if stored properly
Sources
- Official vendor product documentation — At One Place