Water-based acrylic and latex paints can stay good for up to 10 years if never opened and kept from freezing. Leftover paints that have been opened should be closed up tightly, stored in a cool, dry place and used within two years.Click to see full answer. Hereof, does interior paint go bad?The short answer is that yes, paint does go bad. If stored properly you can use oil-based paints for up to 15 years and latex paints for up to 10 years. Paint that has been exposed to extreme temperatures is ruined. Extreme temperatures are anything below 50°F or above room temperature (72°F).Additionally, can you use expired paint? Yes, latex paint does expire! Latex paint does not, however, expire like milk or food does. Paint can, and in most cases will, become unusable after some time in storage. If properly handled, latex paint can be safely stored for several years. Keeping this in consideration, how do you know if paint has gone bad? Pry the lid off the can with a screwdriver and smell inside. When the paint is good and still usable the can is full of gases that generate a strong chemical smell. Paint has gone bad when it has a strong rancid odor.How long can paint sit before it needs to be shaken again?It depends on how big your space is, of course, but it can take anywhere from two to three hours to put on the first coat. You’ll need to wait another two hours for the paint to dry before applying a second coat. In total, that’s anywhere from eight to twelve hours for a bedroom or medium-sized living room.