One-Component Polyurethane Waterproof Coating – Moisture-Curing, Seamless Elastic Waterproof Membrane

One-Component Polyurethane Waterproof Coating

The one-component polyurethane waterproof coating is a moisture-curing material. Its film-forming substance is an isocyanate-terminated polyurethane prepolymer, synthesized from polyether polyols and isocyanates, with additives including catalysts, diluents, defoamers, and anti-aging agents.

When applied to a substrate, the prepolymer reacts with moisture in the air, forming urea linkages that crosslink into a durable elastic membrane with excellent waterproof performance.

Product Specification Types

• By performance: Type I, Type II
  
• By harmful substance content: Class A, Class B
  
• By exposure: Exposed, Non-exposed
  

Product Features

• Moisture-curing: Can be applied directly on damp substrates.
  
• Seamless elastic membrane: Forms a continuous waterproof layer with high tensile strength and elongation, adapting to substrate cracking and movement.
  
• Easy application: No on-site mixing required.
  
• Optional colored coating: Can be produced in various colors.
  
• Non-toxic and odorless: Environmentally friendly material.
  

Scope of Application

• Suitable for roofs, basements, bathrooms, bridges, cold storage, pools, and other waterproofing and moisture-proof projects.
  
• Ideal for complex shapes, pipe junctions, and can also be used as an anti-corrosion coating.
  

Executive Standards

• GB/T 19250-2013 《Polyurethane Waterproof Coating》
  

Construction Method

1. Substrate preparation: Ensure a solid, flat, dust- and oil-free surface. All fixtures, drains, and sanitary equipment must be securely installed with smooth edges.
   
2. Detail reinforcement: Apply additional layers on corners, pipe bases, cracks, and expansion joints.
   
3. Coating application:
   
   • Generally applied 3–4 times, at 2.5–3 kg/m², thickness 1.5–2 mm.
     
   • Optionally, embed glass fiber fabric to increase strength.
     
4. Waterproof roll application: Lay waterproof rolls and treat overlaps with the coating.
   
5. Inspection and protection: Apply protective layers according to design; restrict access until fully cured.
   

Construction Tips:

• Ensure ventilation; ambient temperature ≥5°C.
  
• Avoid construction in rainy conditions.
  
• Opened packaging should be used entirely; leftover coating must be sealed to prevent curing.
  
• Repair damaged coating by cutting the affected area and applying the coating.
  
• Clean tools immediately after use.
  
• For high-viscosity coating, add a company-recommended diluent only.
  
• In low temperatures, hot air assistance can be used.
  

Packaging, Transportation, and Storage

• Packaged in sealed metal or plastic containers with lids.
  
• Store different types and specifications separately.
  
• Avoid sunlight, rain, fire, collisions, and ensure ventilation.
  
• Storage temperature ≤40°C.
  
• Shelf life: ≥6 months from production date under proper storage and transport conditions.
  

Construction Timing / Usage

• Primary Use: New Construction / Pre-Construction (applied during building phase for waterproofing roofs, basements, and complex structures)
• Secondary Use: Post-Construction / Repair & Renovation (ideal for repairing leaks, cracks, or reinforcing existing waterproof layers)