How long does Stans sealant last? According to the manufacturer, Stans sealant will last up to two years in a tyre, but this can vary based on a range of factors from weather conditions and terrain, to how frequently you use your bike. Does Stans sealant expire? In terms of shelf-life, Stans sealant doesn't have an expiration date and will last for many years if stored correctly, so you can enjoy a long-lasting solution for repairing your bike tyres. These sealant bottles should be kept in a cool and dry place and sealed tightly after every use.