Durable Waterproof Coating for Extreme Environments
Winsir Polyurethane Waterproof Topcoat uses polyurethane resin as the main component. It combines the excellent adhesion of polyurethane with waterproof functionality. Through crosslinking with an isocyanate hardener, it forms a seamless waterproof film. This polyurethane waterproof topcoat has excellent strength, flexibility, and waterproof properties. It resists corrosion from acids, alkalis, salts, and many chemicals. It protects the substrate from corrosive damage. The film is dense and pore-free. It has good impermeability and prevents water and liquids from penetrating the substrate.


Isocyanate Crosslinking for Superior Film Performance
Winsir Polyurethane Waterproof Topcoat delivers excellent durability. The cured film is wear-resistant, impact-resistant, and weather-resistant. It has a long service life and stays stable under harsh conditions. The coating is hard, tough, water-resistant, abrasion-resistant, and chemical-resistant. This polyurethane waterproof topcoat has excellent anti-corrosion properties. It is the best choice for internal anti-corrosion lining. It can cure at room temperature or with heat. Application methods are simple and straightforward. The main components include polyurethane resin for weather resistance and adhesion, weather-resistant pigments like titanium dioxide, and additives like leveling agents and defoamers. The hardener is an aliphatic isocyanate like HDI or IPDI.
Application Areas and Technical Data
Winsir Polyurethane Waterproof Topcoat is used in five main areas. Marine engineering includes large playgrounds, indoor and outdoor swimming pools, offshore facilities, coastal structures, and oil platforms. Transportation includes highway guardrails, bridges, ships, containers, trains, military equipment, and airports. Energy includes hydraulic equipment, water tanks, gas tanks, oil refining equipment, oil storage tanks, power transmission equipment, nuclear power, and coal mining. Heavy industry includes papermaking, pharmaceuticals, food processing, airport equipment, metal containers, chemical plants, and steel mills. Municipal includes gas pipelines, gas holders, natural gas pipelines, water facilities, wastewater treatment, and waste treatment.

Technical Specifications Table
|
Parameter |
Specification |
|
Product Type |
Two-component Polyurethane |
|
Mixing Ratio |
5:1 (by weight) |
|
Color |
Custom (per sample) |
|
Appearance |
Smooth, no impurities |
|
Gloss |
Matte, semi-gloss, gloss |
|
Solid Content |
85% |
|
Fineness |
≤30 µm |
|
Pencil Hardness |
≥2H |
|
Tack-Free Time |
≥30 minutes |
|
Hard Dry Time |
≥24 hours |
|
Bend Test |
2 mm |
|
Impact Resistance |
50 cm |
|
Adhesion (cross-cut) |
Level 1 |
|
Salt Spray Resistance |
≥300 hours (no blister/rust/peel) |
|
Storage |
0 - 35°C, 12 months |
Why Choose Winsir Polyurethane Waterproof Topcoat
You need a reliable waterproof topcoat for harsh environments. Winsir Polyurethane Waterproof Topcoat delivers excellent protection and durability. Choose Winsir and keep your assets safe from corrosion. Contact us today for application guidelines.
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