Which items comprise the corrosion protection applied after repairs?

• A. Weld-through primer, seam sealer, and cavity wax
• B. Primer only
• C. Clear coat
• D. Wax only

Answer: (A)

Corrosion protection after repairs focuses on shielding the metal in three vulnerable areas: welded joints, seam lines, and hollow cavities. Each component serves a specific purpose to stop rust from starting or spreading.

Weld-through primer is applied to bare metal around welded areas. It protects the metal there during and after welding, helping prevent oxidation in the heat-affected zones while still allowing a strong weld. This is essential because welding can remove or damage existing protective coatings, creating a path for moisture to reach metal surfaces.

Seam sealer is added along seams and joints where panels meet. It seals gaps where water, salt, and debris can gather and cause crevice corrosion. The sealer remains flexible to accommodate panel movement and thermal expansion, keeping moisture out over time.

Cavity wax is sprayed or brushed into hollow sections and cavities that aren’t easily coated by normal top coatings. It coats the internal surfaces, forming a protective barrier against moisture and salt that can accumulate inside these closed spaces.

Together, these three provide comprehensive protection: weld-through primer for weld zones, seam sealer for joints, and cavity wax for interior areas. Primer alone wouldn’t seal seams or protect inner cavities; clear coat is a surface finish, not a dedicated corrosion barrier; wax alone doesn’t address seams or weld areas.