Painting over poorly prepared welded areas. The intense heat of welding leaves behind a thin oxidized carbon film layer at and around the welded area. This oxidized contaminant impairs paint adhesion.
Weld imperfections like rough welds, weld spatter or pin holes.
All of these defects result in inadequate covering of the surface by the subsequent paint coating.
Failure to remove weld scale.
How Can I Fix This Problem
Remove all weld contaminants by sanding or grit blasting. Wire brushing does not always work as it only tends to polish the surface.
Don’t hesitate to long prior to painting so as to avoid flash rust from occurring
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