- The surface was not properly prepared (e.g., rust, oil residues were not adequately removed, or the surface was not sanded).
- The wrong primer was applied.
- The primed surface was not dry when the paint was applied.
- Remove the problematic coating by sanding or using a solvent.
- Apply one coat of RUST BLOCKER AQUA and two coats of HARD DUKO or HARD & GLOSS.