In particular, an unopened can of acrylic or latex paint lasts up to 10 years. In the case of unopened oil-based or alkyd paints, the lifespan can be up to 15 years. In addition, chalk paint has a shorter lifespan, 1 to 3 years, and milk paint only lasts 1 to 2 weeks after mixing. Using old paint is fine if the paint hasn't spoiled during storage.
Can old paint be used if it has frozen or has “come back”? No, but sometimes we bring painting back to life. The good news is that if you have an unopened can of paint that has been stored properly, you'll almost certainly still be able to use it. Unopened water-based and latex acrylic paints can last up to 10 years, and alkyd and oil-based paints can last up to 15 years. Unopened paint maintains its liquid and semi-solid ratio, so it's okay to use it after a long period of time.
Once the can is opened and exposed to air, this relationship begins to change. Oil-based paints have a lifespan of between 2 and 15 years. Depending on how well it is sealed and stored. Open paint cans don't last as long, but if the can is sealed after painting and stored in a cool, dry place, such as a heated garage or basement, the paint can last for years. On average, a can of paint lasts about ten years before it needs to be thrown away, although some paint products can last up to 15 years.
According to Brandon Walker, superintendent of ASAP Restoration, the paint can be expected to last several years if it's not opened and stored properly. If these cans are opened or if they are stored in a place where temperature and humidity are not controlled, their lifespan is significantly reduced, he says. Next, Walker recommends the following breakdowns on the lifespan of common paints. In addition, you can wrap it in household plastic as a gasket between the lid and the paint can for a better airtight seal.
One of the best ways to reduce the cost of a painting project is to reuse the paint left over from previous jobs around the house.
