The type of paint (oil-based or latex), whether it has been opened, storage conditions, and brand-specific instructions are some of the variables that might affect how long paint lasts on the shelf. Here, professionals offer advice on extending the shelf life of paint cans and offer insight into how long they should last.
Do Paints Ever Expire
Paint cans that have not been opened will often last longer than those that have been opened or partially used. The type of paint (oil-based vs. water-based), whether or not it has been opened, and storage methods are some of the variables that affect a paint can’s shelf life.
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Water-Based Paint
When stored properly, unopened acrylic paint and water-based latex paint can last up to ten years. As we explain in more detail below, this indicates that the can has a tight seal and hasn’t been exposed to extremely high or low temperatures.
Oil-Based Paint
An oil-based paint can survive up to 15 years if it is not opened. Oil-based paint has a longer lifespan because it maintains its pigment effectively and dries slowly by nature.
Milk Paint
Most frequently used on furniture and cabinets, milk paint is a mixture of milk proteins, lime, and color. While some kinds are sold as powder, others are sold premixed. Although unopened cans may survive three to five years, milk paint manufacturer General Finishes advises utilizing its paints within a year. The paint should be thrown out after use if you thin it with water or mix your own milk paint because the water may contaminate it.
Used Paint
A paint can last for roughly two years after it is opened, though there are a few factors to take into account, such as how the paint is stored. How much of an open can has been consumed? There is more room for problems, such as bacteria growth, to occur in a container with more air space (i.e., more paint used).
The can will spoil more quickly—possibly within months—if it is not properly sealed, letting air in.
Additionally, this may differ by brand. Although we don’t have paint expiration dates, we do offer most architectural coatings a three-year shelf life from the date of manufacture.
Indications That Your Paint Is Bad
The consistency, color, and smell of your paint are the simplest indicators that it is probably beyond its best. If your paint seems lumpy, smells sour, has mold, mildew, or rust on it, or has thick skin under the lid, it’s likely expired. “Lid skinning is similar to pudding in that the paint develops a thick skin on top or the hardened lid.”
A cottage cheese-like consistency, which results from previously frozen paint, is another indication that the paint has expired. When paint ages, its color, quality, and coverage may alter, and its gloss may diminish as its viscosity and odor shift.
How To Properly Store Paint
Proper storage, preventing contamination, and maintaining an airtight seal are essential for longer-lasting paint. Properly storing the gallon in a climate-controlled place is crucial for preserving the paint’s color and durability. Significant temperature swings might cause problems, particularly when it drops below freezing. To prevent paint from freezing, think about keeping it in a closet or basement rather than a shed or garage unless it is temperature controlled, ideally between 60 and 80°F.
Make sure the area is dry and cool. Paint is more likely to become contaminated when kept in a hotter climate. Additional storage tips to think about include avoiding dipping brushes straight into the can, emptying paint into a different container (such as a paint tray), and keeping the lid airtight.
Additionally, always give the paint can a thorough swirl before using it again. For paint to be ready for use, it must be well mixed and allowed to settle.
How to Get Rid of Old Paint
To prevent pollution, paint that has expired or is no longer needed must be disposed of properly. While oil-based paints, which are regarded as hazardous waste, need to be disposed of at a waste collection facility, any dried latex paint can be simply thrown in the garbage. For further options and information, you can also donate it or inquire with your neighborhood recycling facility.
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