What should be done to a surface before applying pins?

• A. Painted
• B. Wiped and clean
• C. Oiled
• D. Sanded

Answer: (B)

Getting a good fit for pins starts with a surface that’s free of contaminants. Wiping the surface clean removes dust, grease, and moisture, so the pins can seat properly and hold securely. A clean surface also helps ensure a reliable mechanical and any practical contact the pins are meant to make. If the surface were painted, oiled, or roughened by sanding, the coating or slick film or rough debris would impede proper seating and grip. Painting creates a barrier, oil makes things slippery, and sanding tends to leave dust and irregularities that can interfere with how the pins sit.