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Adhesives and Sealants Market: Industry Analysis and Forecast - 2029 Adhesives are substances which are capable of holding at least two surfaces together in a strong and permanent manner, whereas Sealants are substances which are capable of attaching to at least two surfaces, thereby, filling the space between them to provide a barrier or protective coating. It can be deduced from these definitions that, while they are similar in function, they each have a distinct application purpose.