While many industrial sealants, such as those offered by 3M and Loctite, are designed to be waterproof, not all sealants have this property. It is essential to choose the right type of sealant based on the specific needs of your project. For example, if you are working on a project that will be exposed to water or high humidity, a waterproof sealant is necessary to prevent water infiltration and damage. Always check the product specifications to ensure that the sealant you select is suitable for your particular application.