LEMAN PU 680 Waterproofing

I. PRODUCT DESCRIPTION

LEMAN PU 680 is a one-component, PU-Acrylic dispersion-based waterproofing coating applied in liquid form. The product forms a seamless waterproof membrane with excellent resistance to water ponding, UV protection, crack-bridging capability, and a highly aesthetic finish.

It is a durable waterproofing solution suitable for both new construction and renovation projects, ideal for roofs, terraces, and balconies, especially areas with complex details or difficult access.
Additionally, the coating has solar reflectivity, helping to reduce surface temperature and save cooling energy for buildings.

II. ADVANTAGES OF LEMAN PU 680 WATERPROOF COATING

• Superior water ponding resistance, suitable for flat roofs and areas prone to standing water.
   
• Excellent UV resistance, anti-yellowing, and anti-aging properties for long-lasting durability.
   
• High elasticity and excellent crack-bridging on concrete and cementitious surfaces.
   
• Non-toxic, low VOC, and environmentally friendly.
   
• Easy application — single-component product, ready to use without complex mixing.
   
• Forms a seamless, joint-free waterproof membrane for enhanced structural durability.
   
• Allows the surface to breathe, preventing blistering or delamination due to trapped moisture.

III. PACKAGING AND PRODUCT DATA

• Chemical base: Modified Polyurethane–Acrylic dispersion
   
• Color: White, Grey (most common)
   
• Packaging: Plastic pails of 5 kg and 18 kg
   
• Density: ~1.30 kg/L (at 30°C)
   
• Solid content: ~60% by weight
   
• Storage condition: Store in a cool, dry place at temperatures between +5°C and +30°C

IV. APPLICATION INSTRUCTIONS

1. Surface Preparation

• Concrete surface must be at least 28 days old with adhesion strength ≥ 1.5 N/mm².
   
• Remove dust, oil, moss, and other contaminants. Repair cracks and surface defects.
   
• Grind or sandblast to roughen the surface; ensure it is clean and completely dry before application.

2. Primer Coat

• Apply LEMAN Primer 18 or LEMAN PU 680 diluted with 10% clean water as a primer at approx. 0.3 kg/m².
   
• Allow the primer to dry (1–2 hours depending on temperature).

3. Main Coating

• Apply two coats of LEMAN PU 680 (undiluted).
   
• Allow 4–6 hours between coats depending on site conditions.
   
• For areas prone to movement or cracking, reinforce with non-woven fiberglass mesh.
   
• Total consumption: 1.5–2.1 kg/m² depending on the system.

4. Drying Time

• Touch dry: 1–2 hours
   
• Rainproof: 6–10 hours
   
• Fully cured: 2–4 days

5. Application Notes

• Ambient temperature: +15°C to +35°C; relative humidity < 80%.
   
• Do not apply during rain or on damp substrates.
   
• Avoid water ponding during application and before full curing.
   
• Ensure roof slope ≥ 0.5% for proper drainage.

SHELF LIFE

12 months from the manufacturing date when stored in the original, unopened container under proper conditions.

Minh Nguyet