Determine if the paint is still in good condition Latex has a lifespan of 10 years. If it has been frozen, it may not be usable. Try stirring and brushing on newsprint. If there are lumps, the paint is no longer good.
Using old paint is fine if the paint hasn't spoiled during storage. Can old paint be used if it is frozen or “rotated”? No, but sometimes we resurrect painting. Latex paint in its original impeccable condition, even sealed in the paint store and never used, can last up to a decade. A can of the same type of paint used before, poorly sealed and with unwanted impurities, can last only a few months.
The liquid on the top and the solids on the bottom don't necessarily mean the paint is bad. Leftover latex paint can last for years, even a decade, or go bad in just a few months. Pull out the lid of the can with a screwdriver and smell the inside. When the paint is good and can still be used, the can is filled with gases that generate a strong chemical odor.
The paint spoils when it has a strong rancid smell. Because of a head injury 20 years ago, I lost my sense of smell (and it turns out I have a lot of old paint), so I'll have to ask someone to test my sense of smell. If the oil and paint separate again or don't mix at all, but instead look more like curdled, lumpy milk, there's no way to save that. Simply turn the can upside down a few times, stir it gently, or use a paint stick to re-incorporate the paint.
Unopened acrylic water-based and latex paints can last up to 10 years and alkyd and oil-based paints can last up to 15 years. When you open your old can, notice the smell of paint (no, I'm not telling you that you smell paint). Now that you know how to check if your old paint can still be used, it's time to get to work and start painting. A can that has been properly opened and resealed can easily last a decade in storage, while unopened paint can last up to 15 years.
Painters in Wilmington Nc consider the best way to store latex paint is to store it in an airtight container to prevent the water it contains from evaporating and to prevent microorganisms from entering. However, the milk proteins added to this type of paint give it a shelf life of a few days to a week once mixed. While chalk paint can last 1 to 5 years if stored properly, chalk paint will dry much faster than if left exposed to air. That six-month lifespan isn't a guarantee either; as Consumer Reports points out, “leftover latex paint can last for years, even a decade, or break down in just a few months.
To begin with, you should know that latex paint is used for almost everything today, including interior and exterior applications, such as walls, moldings and doors. Let's take a look at how long the paint has been good for, why it breaks down, and what to do if it's on the other side of the hill. If more time goes by, the paint may lose its luster and your retouching attempts won't integrate into the wall and you may have to repaint a larger area.