As with most things in life, the answer to this question depends on a number of factors. The type of spray sealant you use, the conditions it's exposed to, and how well you maintain it will all play a role in how long your sealant lasts. With that said, most spray sealants will last for several months if properly applied and cared for. If you live in an area with harsh weather conditions, you may find that your sealant doesn't last as long as it would in more moderate climates. To get the most out of your spray sealant, be sure to follow the manufacturer's directions for application and care. This will help ensure that your sealant lasts as long as possible.