What is corrosion protection applied after structural repairs?

• A. Weld-through primer, seam sealer, and cavity wax
• B. Paint thinner
• C. Aluminum coating
• D. Rubberized undercoating

Answer: (A)

After structural repairs, protecting exposed metal from corrosion is essential. The best approach is to apply a weld-through primer on the weld areas to form a protective barrier that helps prevent corrosion around the new welds, even though welding can heat and affect coatings. Sealing the joints with seam sealer stops moisture, salts, and contaminants from entering seams and crevices where rust often starts. Spraying or brushing cavity wax into hollow sections and behind panels protects interior surfaces where water can accumulate and corrosion can develop long after the repair is done.

Paint thinner isn’t a protective coating; it’s a solvent used for cleaning or thinning finishes. An aluminum coating isn’t typical for protecting repaired steel areas and can create compatibility issues with the existing coating system. Rubberized undercoating is mainly for the underbody and surface protection, not for sealing joints or protecting internal cavities after structural work.