Rainwater systems coating structure
1. Zinc layer
2. Passivation layer
3. Primer
4. Coating
5. Steel sheet
6. Zinc layer
7. Passivation layer
8. Primer
9. Coating

1. Zinc layer
2. Passivation layer
3. Primer
4. Coating
5. Steel sheet
6. Zinc layer
7. Passivation layer
8. Primer
9. Coating

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