Question:
Which of the following defect is observed during painting due to application of relatively fast drying coat over one which is too soft?
Which of the following defect is observed during painting due to application of relatively fast drying coat over one which is too soft?
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Alligatoring = "Reptile skin" pattern. It happens when the "bottom" layer is too "bouncy" or soft for the "top" layer.
Updated On: Jul 23, 2026
- Alligatoring
- Blistering
- Cracking
- Wrinkling
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Painting defects occur due to environmental factors, poor surface preparation, or improper application techniques.
In a dairy plant, where humidity is high and surfaces must be protected, understanding these defects is crucial for maintenance.
Step 2: Detailed Explanation:
The specific defect described—applying a hard, fast-drying topcoat over a soft, slow-drying undercoat—leads to a pattern of cracks resembling the skin of a reptile.
This is known as Alligatoring.
Because the undercoat is still soft and perhaps expanding or contracting at a different rate than the rigid topcoat, the topcoat "breaks up" into separate islands.
Let us look at the other options:
Blistering (Option 2): Caused by moisture or gases trapped behind the paint film, creating bubbles.
Cracking (Option 3): A general term for the failure of the paint film, but "alligatoring" is the specific name for the "soft-over-hard" mismatch.
Wrinkling (Option 4): Occurs when the surface of the paint dries too fast while the body underneath is still liquid, often caused by applying a coat that is too thick.
To prevent alligatoring, painters must ensure that each coat is completely cured and that the "rule of thumb" (long-oil/flexible coats under short-oil/harder coats) is followed.
Step 3: Final Answer:
The defect is known as Alligatoring.
Painting defects occur due to environmental factors, poor surface preparation, or improper application techniques.
In a dairy plant, where humidity is high and surfaces must be protected, understanding these defects is crucial for maintenance.
Step 2: Detailed Explanation:
The specific defect described—applying a hard, fast-drying topcoat over a soft, slow-drying undercoat—leads to a pattern of cracks resembling the skin of a reptile.
This is known as Alligatoring.
Because the undercoat is still soft and perhaps expanding or contracting at a different rate than the rigid topcoat, the topcoat "breaks up" into separate islands.
Let us look at the other options:
Blistering (Option 2): Caused by moisture or gases trapped behind the paint film, creating bubbles.
Cracking (Option 3): A general term for the failure of the paint film, but "alligatoring" is the specific name for the "soft-over-hard" mismatch.
Wrinkling (Option 4): Occurs when the surface of the paint dries too fast while the body underneath is still liquid, often caused by applying a coat that is too thick.
To prevent alligatoring, painters must ensure that each coat is completely cured and that the "rule of thumb" (long-oil/flexible coats under short-oil/harder coats) is followed.
Step 3: Final Answer:
The defect is known as Alligatoring.
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