I. System Selection & Compatibility
Q1: In which scenarios can the system integration products be applied?
Applicable to industrial floors, landscape pavements, wall substrates, rooftops, swimming pools, plazas, and exposed concrete structures.
The core concept is system compatibility—integrating primer, intermediate coat, protective layer, and clear coat into a unified system to ensure strong adhesion and long-term durability.
Q2: How to choose between ST300 and ST400 primers?
- ST300: For dense substrates such as ceramic tiles, marble, or existing epoxy coatings.
- ST400: For concrete or cement-based surfaces with anti-alkali and sealing properties.
If the substrate type is uncertain, perform a small adhesion test. For high-absorption surfaces, apply two coats for better sealing.
II. Intermediate & Clear Coat Selection
Q3: What are the differences among the ZM Series surface coatings?
- ZM01 & ZM02: Industrial floor type with abrasion and dust resistance.
- ZM03: Light-duty, waterproof, and wear-resistant type.
- ZM06: Polyaspartic polyurea system with the highest waterproof, UV, and chemical resistance.
Tip: The ZM Series should be applied on sealed concrete or metal substrates. Do not apply directly on powdery or unsealed surfaces.
Q4: What are the differences between the QT Series and HS47 clear coats?
- QT Series (QT01/02/03): Designed for industrial and general protection systems.
- HS47: Specially for resin-exposed aggregate (washed stone) systems.
Do not mix the two systems. QT Series is available in matte, semi-gloss, and high-gloss finishes to suit different decorative requirements.
III. Application & Environmental Control
Q5: How to ensure intercoat adhesion?
Follow three key steps:
- Keep substrate free from oil, dust, and efflorescence.
- Observe correct recoating intervals: Primer → Intermediate ≥4h; Intermediate → Clear Coat ≥6h.
- If recoating exceeds 24h, lightly sand the surface before reapplication.
Q6: Can the coating be applied on damp substrates?
Yes, under moist but non-waterlogged conditions. However, high humidity will extend drying time.
Tip: Postpone application if relative humidity >85% to prevent whitening, blistering, or efflorescence.
Q7: What is the recommended application temperature range?
5–35 °C, relative humidity ≤85%. Low temperatures slow curing; avoid heavy coating and direct sunlight at high temperatures. Mix in small batches.
Q8: Can construction proceed during rainy or humid weather?
Not recommended. Rain within 24 hours after application may cause whitening or loss of gloss. Choose stable weather conditions.
Q9: What equipment is recommended for application?
Use airless spray, roller, or brush.
For clear coats, use short-nap rollers or soft brushes for an even finish. Clean tools with water immediately after use.
IV. Performance & Appearance
Q10: What is the expected service life of the system?
With correct application and maintenance:
- Industrial or concrete structures: 5–8 years protection.
- Exposed steel structures: 3–5 years protection.
Regular recoating extends service life.
Q11: Will the clear coat yellow over time?
No. Both QT Series and HS47 adopt anti-yellowing polyurethane emulsions (ΔE < 1.0). They remain clear and glossy under long-term outdoor exposure.
Q12: What causes whitening or efflorescence after application?
Usually due to high substrate moisture or ambient humidity.
Ensure substrate moisture ≤8% and extend drying time if needed.
Q13: How to fix uneven or dull surface appearance?
Mix thoroughly and avoid over-rolling.
For local unevenness, lightly sand and reapply clear coat after full curing.
V. Maintenance & Renovation
Q14: When can the coated surface be opened for use?
At 25 °C:
- Light traffic: after 24 hours
- Full cure: after 48 hours
Outdoor applications should dry completely before rain exposure.
Q15: How often should the protective layer be recoated?
Inspect every 2–3 years. Recoat as needed based on wear or UV exposure.
Before recoating, remove oil or wax residues; wipe with alcohol if necessary.
Q16: Can the coating be applied directly over old coatings?
Yes, but remove chalking or contaminated layers first.
Sand the surface before applying primer or protective coat.
Tip: Avoid over-sanding to prevent structural damage and adhesion loss.
Q17: Can the clear coat be used alone?
Yes, as a transparent protective layer over existing coatings.
For structural protection, pair with primer for better sealing performance.
VI. After-Sales & Warranty
Q18: What is the warranty period?
12 months from production date. Store at 5–35 °C and protect from freezing.
Within the warranty period, defective products due to quality issues will be replaced free of charge.
Q19: What conditions are not covered by warranty?
Moist substrates, insufficient substrate strength, incorrect mixing ratio, mixing with other brands, improper environment, or off-label use.
Q20: Are samples and technical support available?
Yes. Huacheng provides samples, remote application guidance, and on-site training support.
VII. Construction Experience & Common Issues
Q21: Can ZM Series coatings be combined with other brands’ clear coats?
Not recommended. Different chemical systems may cause intercoat stress differences, leading to peeling or gloss loss. Always use Huacheng’s complete system.
Q22: What causes surface roughness after protective coat application?
Typically due to high humidity or overly thick, fast-drying layers.
Use low-speed mixing, allow sufficient leveling time, and reapply clear coat if needed.
Q23: How to clean tools and equipment after application?
Clean with water immediately after use.
If the coating has dried, soak in warm water and gently brush.
Q24: Can the product still be used after freezing during transport?
Yes. Allow natural thawing before use.
If severe clumping or separation occurs, discard the product.
Q25: Are these products hazardous? Can they be exported?
All systems are waterborne and eco-friendly, non-hazardous, and fully compliant with marine and air transport standards.