It is best to use it once it has been opened, but if you cannot…you should try to use the remainder within 3 months. It is imperative that you seal the container well to avoid the product drying out. Any unopened container should be used within 12 months and protected from freezing or superheating while in storage. Once the product has been applied and cured, freezing and heating are no longer an issue. This product is >50% solids, so it will settle over time, make sure to mix or shake it thoroughly before any use.
What is the life of opened & unopened can?