1. Probable Cause / Reason:
•    Redissolving of previous coat due to strong solvents in topcoat.
•    Use of incompatible coating systems over sensitive substrates.
•    Soluble materials like tar or bitumen migrating into topcoat layers.
•    Inadequate sealing or preparation of the previous coating layer.

2. Correction / Repair:
•    Remove the affected topcoat and contaminated layers if necessary.
•    Apply an appropriate sealer coat to block stain migration.
•    Recoat using a compatible system with low solvent strength.
•    Ensure the underlying coat is fully cured before topcoat application.

3. Corrective Action / Prevention: 
•    Use correct and compatible coating specifications and materials.
•    Apply effective sealer coats over sensitive or bituminous surfaces.
•    Avoid strong solvent-based topcoats directly over soluble materials.

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