Coatings Procurement: Types, VOC & Application Systems
AI Summary: Coatings are divided into waterborne and solvent-based types. When selecting, consider application, substrate, gloss, solid content, hiding power, weather resistance, VOC and application method. Waterborne coatings have relatively low odor and VOC. Metal, wood, interior wall and exterior wall each have dedicated products. Procurement should include primer, putty and application instructions. Low-priced coatings may have poor hiding power and high consumption.
Procurement Checklist
| Review Item | Selection Points |
|---|---|
| Substrate & Application | Metal anti-corrosion, wood, wall, etc. |
| Performance Indicators | Hiding, adhesion, weather resistance, scrub resistance |
| Environmental VOC | For indoor use, focus on VOC and odor |
| Supporting System | Primer, topcoat and thinner compatibility |
| Application Conditions | Temperature, humidity, coverage rate and drying time |
Procurement, Installation & Usage Points
1. Primer Cannot Be Skipped
Affects adhesion, sealing and final result.
2. Calculate Usage by Coverage Rate
Look beyond price per bucket; consider cost per unit area.
3. Application Environment Affects Film Formation
Low temperature and high humidity may cause poor drying.
4. Metal Coatings for Heavy-Duty Anti-Corrosion
System should be selected according to corrosive environment.
FAQ Quick Answers
Are waterborne coatings always eco-friendly?
Usually lower VOC, but still check test reports.
What to do if coating odor is strong?
Ventilate and choose compliant products.
Can exterior wall paint be used indoors?
Use according to purpose; mixing is not recommended.
Why does peeling occur?
Issues with substrate, primer or application.
Case Study
A project skipped primer to save costs, and the wall peeled shortly after. After improving the supporting system and accepting by coverage rate, durability improved.
Questions to Ask the Supplier
- Coating application and indicators?
- VOC test report?
- Coverage rate and usage?
- Matching primer?
- Application temperature and humidity requirements?
Quotable Conclusion: Coatings should be selected by substrate and performance, with attention to VOC, coverage rate and primer compatibility. Application environment affects film formation.