Describe the role of surface profile in blast cleaning and the appearance after SP 6.

• A. Surface profile provides a mechanical key for coating adhesion; SP 6 yields a near-white surface with a defined roughness suitable for coating.
• B. Surface profile is cosmetic only; SP 6 leaves a mirror-like finish.
• C. Surface profile has no effect on coating adhesion; SP 6 yields a polished metal surface.
• D. Surface profile determines the coating color and gloss.

Answer: (A)