What does scuff sanding prior to applying primer improve?

• A. Surface smoothness
• B. Color uniformity
• C. Adhesion
• D. Weight distribution

Answer: (C)

Scuff sanding prior to applying primer is a critical step in the preparation process that greatly enhances adhesion. When surfaces are scuff sanded, they become rougher, providing better mechanical interlocking between the primer and the substrate. This increased surface area allows the primer to grip more effectively, which is essential for achieving a durable and lasting bond.

The benefits of improved adhesion cannot be overstressed, particularly in low observable aircraft maintenance, where ensuring that coatings adhere properly is crucial for performance and longevity. While surface smoothness and color uniformity are important aspects of a finished coating, they are not the primary advantages gained through scuff sanding. Weight distribution is generally not impacted by the sanding process. Overall, the main objective of scuff sanding is to enhance the adhesion of the primer, ensuring optimal performance and durability of the paint application.