If you have any doubt if your paint is still good or not, throw it out. Open the finish. Get Started. After years in storage this separation can become irreversible. The point is I've decided to use what will be an enormous amount of excess, incredibly expensive, DKC paint to paint the guest room. Old cans of interior paint may remain usable for several years if they have been kept tightly sealed and stored away from freezing temperatures. If you have any doubt if your paint is still good or not, throw it out. Hottest Interior Paint Colors of America's Finest Exterior Home Depot. Apply the finish to the sample. Home Questions Tags Users Unanswered. Here are some tips to help you evaluate how long your paint will last. Make these small tweaks to your home and daily routine, and life will be easier, less rushed and maybe healthier too. If I were you, I'd stop at the paint desk at Home Depot and ask. Neutral-Colored Rugs by Material. 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.