When is it appropriate to use an adhesive instead of putty?

Using an adhesive instead of putty is appropriate when additional strength is required in the bonding process. Adhesives are specifically formulated to create strong, durable bonds between surfaces, which is especially important in applications where mechanical strength is critical to the integrity of the assembly. This is particularly true in composite materials, where the bond must withstand various stresses and loads during operation.

Adhesives generally have superior shear strength and tensile properties compared to putty, making them more suitable for applications that demand a robust connection. This characteristic allows for better load distribution across bonded surfaces, enhancing the overall strength of the composite structure. In contrast, putty is often used in applications focusing on filling gaps or voids rather than providing structural integrity.

While decorative finishes or fast curing times might be relevant considerations in specific contexts, they do not direct the primary purpose and advantage of using adhesives over putty in terms of strength. Similarly, sealing outer surfaces may also be accomplished with both materials, but again, this does not inherently require the high strength that adhesives provide.