how long does paint last
Quick Answer. Opened oil-based paint can last for up to 15 years if sealed correctly. Latex paint can last up to 10 years.
From what I have read it varies with the quality of the paint and the storage conditions,but 3-5 years is reasonable for unopened cans. Most of the evidence seems anecdotal. There always seems to be a case of someone using something 20 years old that they got for free and it lasted 30 years.