Before applying additional top coats, what should be done with weld-through primer?

• A. Remove excess weld-through primer
• B. Leave as is
• C. Sand lightly
• D. Wipe with solvent

Answer: (A)

When preparing to apply top coats, the surface around welded joints should be clean and allow good paint adhesion. Weld-through primer protects the weld area, but excess primer can act like a barrier to adhesion and trap solvents, leading to poor paint bonding or finish problems. Removing the excess weld-through primer ensures a clean, even surface for the topcoat to bond to, giving a better, more durable finish.

Leaving the primer as is can cause adhesion issues; sanding lightly might change the texture but won’t reliably remove excess in the weld area; wiping with solvent could remove primer unintentionally or leave residues. The correct practice is to remove the excess weld-through primer.