Can you use 10 year old primer? If it’s unopened, it’s probably still usable.
Unused latex and water-based acrylic paints last up to 10 years, and the shelf life of alkyd and oil-based can be as long as 15 years.
How long does primer stay good for? Primer can go bad just like regular paint, and it has a much shorter shelf life. Most primers have a storage life of two to three years, considerably less time than a paint can.
How do you know if paint primer is bad? You can tell paint has gone bad by the smell and texture. A rancid or sour-smelling paint means your paint has gone bad. In particular, the smell of bad paint is similar to sour milk.
How long does Kilz primer last after opening? Normal shelf life of KILZ primer or paint (in-store) would be 2 years if not opened. Since it was opened its hard to predict. I’ve got a full, but opened, can that is 5-15 years old (not sure exactly).