What is the primary concern when applying adhesive?

The primary concern when applying adhesive is surface contamination. Proper adhesion is critical for ensuring the integrity and strength of the bond between materials. If the surfaces to be bonded are contaminated with dirt, oil, grease, moisture, or any foreign substance, the adhesive may not properly adhere, leading to bond failure. Surface preparation is vital because clean surfaces allow for maximum interlocking and chemical bonding, ensuring that the adhesive performs as intended.

While the other factors, such as adhesive color consistency, cost, and the amount of adhesive used, can be important in specific contexts or preferences, they do not impact the fundamental effectiveness of the adhesive bond to the same extent as surface cleanliness does. Contaminated surfaces can lead to significant structural issues over time, making proper cleaning and preparation the top priority in adhesive application.