1. Probable Cause / Reason:
•    Insufficient film thickness of the topcoat, leading to poor coverage.
•    Poor opacity and covering power of the topcoat.
•    Strong color or contrast from the primer or undercoats showing through.
•    Applying lighter colors over dark-colored primers or undercoats.

2. Correction:
•    Apply adequate dry-film thickness between individual coats to ensure full coverage.
•    Use coatings with good opacity and hiding power to cover the underlying surface effectively.
•    Apply additional coats if necessary to achieve full coverage and prevent the underlying surface from showing through.
•    Consider using a primer or undercoat with better hiding properties.

3. Corrective Action / Prevention :
•    Remove the affected coating and ensure proper surface preparation before re-coating.
•    Reapply the topcoat with sufficient thickness to hide the underlying surface.
•    Use coatings with higher opacity or better hiding power for future applications.

BG GROUP OF PAINT AND COATING CONSULTANT
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