Adhesives and sealants are often used in similar repair and installation environments, but they are selected for different purposes.
An adhesive is primarily chosen to bond two surfaces together. A sealant is primarily chosen to close gaps, resist leakage or protect joints from moisture and air movement.
Choosing the right product depends on the material, load, exposure, flexibility and expected service condition. For durable results, users should clean the surface, choose a suitable product and allow proper curing time.