Exterior stone-effect paint suitable for subtropical climates
Subtropical-Exterior Stone-Effect Coating
| Section | Key Point | Technical Parameter / Recommended Practice | Rationale for Subtropical Climate (high temp & humidity, intense UV, heavy rain) |
|---|---|---|---|
| Climate Adaptability | Temperature & Humidity Limits | Application: 5 °C – 35 °C; Relative humidity < 75 % | Prevents whitening, blistering, or poor adhesion caused by excessive moisture |
| UV Resistance | Silicone-acrylic resin system; UV resistance ≥ 800 h | Maintains color and prevents chalking under strong sunlight | |
| Mildew & Moisture Resistance | Add mildewcide; meets GB/T 1741 Grade 0 (no mold growth) | Controls mold/blackening in prolonged humid seasons | |
| Salt-Spray Resistance (coastal) | Passes 500 h salt-spray test without blistering or peeling | Protects façades from sea-salt corrosion in coastal subtropical zones | |
| Material Selection | Stone-Effect Coating | Natural colored sand + inorganic silicone-acrylic emulsion; stone-likeness ≥ 95 % | Realistic texture, excellent weatherability, low VOC |
| Sealing Primer | Alkali-resistant, penetrating power ≥ 0.8 mm | Prevents efflorescence and peeling from alkaline substrates | |
| Top Clear Coat | Weather-resistant acrylic topcoat; matte or semi-gloss options | Adds hydrophobic & dirt-shedding layer, extends service life beyond 10 years | |
| Construction Process | Substrate Preparation | Moisture content < 10 %; pH ≤ 10; surface evenness deviation ≤ 2 mm | Avoids hollow drumming or detachment from damp substrates |
| Groove & Joint Layout | Double-groove technique to enhance 3-D effect and weather resistance | Compensates thermal movement, improves visual depth | |
| Application Sequence | Primer → stone-effect coat → clear topcoat; minimum 12 h between coats | Ensures inter-coat adhesion, prevents lifting | |
| Tools & Technique | Dedicated spray gun + trowel; spray pressure 0.6–0.8 MPa | Achieves uniform grain, avoids runs | |
| Post-Application Care | Cleaning Cycle | Wash once every 12 months with neutral detergent | Removes dust & pollutants, retains color & waterproofing |
| Inspection Focus | Before every rainy season: check for cracks, hollow spots, mildew | Early repair prevents moisture ingress | |
| Local Repair | Touch-up with same batch/color stone-effect coating to avoid color difference | Maintains overall aesthetics, prevents localized aging from spreading |