Mod Podge doesn’t have a set expiration date, but its quality can decline over time. If you keep it tightly closed and store it in a cool, dry spot, it can stay usable for quite a while, often for a few years. As it ages or if it hasn’t been stored well, you may start to notice changes. It can become thick or clumpy, or separate in a way that doesn’t fully blend back together. A strong or unpleasant smell, or a shift in color toward yellow or brown, is also a sign that it may no longer be safe to use. Exposure to freezing or extreme heat can damage it as well.
