FAQs About Polyurethane Waterproof Coatings

1. What is a solvent-based polyurethane waterproof coating?
A solvent-based polyurethane waterproof coating is a high-solids, single-component membrane used for waterproofing concrete, masonry, and wood. It is ideal for retaining walls, roofs, below-grade applications, and tunnels. This product provides excellent protection against water ingress, and its durability ensures long-lasting performance under extreme temperature fluctuations.

2. How do I apply solvent-based polyurethane waterproof coating?

• Surface Preparation: The surface should be dry, smooth, and free from dust, dirt, or other impurities. Use a shovel to flatten any mortar blocks or protrusions, especially around water pipes and drain outlets, to ensure a clean, even base.

• Application Process: Typically, three coats are required. After the first coat has cured for 12-24 hours, apply the second coat perpendicular to the first. If you're adding a rigid protective layer on the third coat, sprinkle a thin layer of clean sand before the coating is fully cured to improve bonding. After the sanded coating has cured, you can proceed with the protective construction.

• Detailing: For corners, pipe roots, cracks, and deformation joints, apply an additional layer to ensure complete waterproofing in these critical areas.

3. What is the recommended curing time for polyurethane waterproof coatings?
The skin time for the coating is approximately 6 hours, while the coating will be ready for light traffic after 24 hours. Full curing may take longer depending on the environmental conditions.

4. Can solvent-based polyurethane coatings be used on all surfaces?
Yes, solvent-based polyurethane coatings are versatile and can be used on various surfaces, including concrete, brick, and certain metals (such as non-coated metal roofs). The coating adheres well to these substrates without needing special primers.

5. What are the key benefits of using this polyurethane waterproof coating?

• High Strength and Durability: The coating has a tensile strength of 6.0 MPa and a high elongation rate of 659%, making it highly resistant to cracking and damage.

• Excellent Temperature Resistance: It performs well in both high and low-temperature conditions, providing year-round protection.

• Superior Bonding: The coating adheres well to a wide range of surfaces without requiring additional chemical aids.

• Customization: The coating is available in various colors, including white and grey, and can be tailored to meet specific project needs.

6. How do I ensure the longevity of the waterproof coating?
To maximize the effectiveness of your coating:

• Ensure proper surface preparation by cleaning and smoothing the base layer.

• Avoid any physical interference, such as walking on or placing objects on the coating before it has fully cured.

• For areas exposed to heavy traffic or wear, additional protective layers may be applied to extend the coating’s lifespan.

7. What safety precautions should be followed during application?
Always wear protective equipment like gloves and goggles when handling the polyurethane coating. In case of eye contact, rinse immediately with plenty of water and seek medical attention if necessary. Store the coating in a cool, dry place, and keep it out of reach of children.

8. How should the coating be stored?
Store the polyurethane coating in its original, tightly sealed packaging in a cool and dry location. The ideal temperature range for storage is between 0°C and 30°C. The shelf life is about 18 months when stored properly.

9. Is this product environmentally friendly?
While polyurethane coatings offer excellent waterproofing, always ensure that the product is applied in well-ventilated areas to minimize exposure to fumes. As a solvent-based product, it is important to follow local regulations regarding disposal and environmental impact.

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