What is the purpose of primer?

• A. To promote adhesion and protect the surface
• B. To color-correct the base
• C. To increase topcoat gloss
• D. To remove rust

Answer: (A)

Primer serves to create a solid, even foundation for the paint by promoting adhesion between the surface and the topcoat while also protecting the surface. On bare metal or repaired areas, primer seals porosity, blocks stains, and adds corrosion resistance, so the color coats go on smoothly and consistently. A good primer also helps control how the surface absorbs paint, which leads to a more uniform finish and reduces the chance of peeling or lifting over time.

Color correction or matching is handled by the basecoat or color layer, not the primer. Increasing topcoat gloss is a result of the final finish and clear coat, not the primer. Removing rust is done before priming; primers provide protection and adhesion, not rust removal.