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ZUOTONG 2K clear coat and topcoat hardener is a polyisocyanate-based curing agent formulated for use with ZUOTONG 2K clear coats and solid-color topcoats in automotive refinishing. When mixed at the specified volume ratio, this hardener initiates cross-linking with the acrylic resin system, delivering a cured film with measured yellowing resistance, mechanical strength, and chemical resistance. The product line covers seven hardener series, each calibrated to a specific clear coat or topcoat formulation and available in fast-, standard-, and slow-drying grades to match ambient application temperatures.
The hardener reacts with the hydroxyl-functional resin in 2K clear coats and topcoats to form a polyurethane network. This reaction produces a film with measurable resistance to diesel, mild acids, and common automotive solvents. The formulation is designed to minimize yellowing under UV exposure over the service life of the repair.
Each hardener series is offered in three drying speeds selected by workshop temperature:
Type K (fast-drying): for ambient temperatures below 18°C
Type B (standard-drying): for ambient temperatures between 18°C and 30°C
Type M (slow-drying): for ambient temperatures above 30°C
This grading allows applicators to maintain consistent flash-off and curing times across seasonal temperature changes.
The ZTH770 (winter) and ZTH772 (summer) hypercure hardeners incorporate an accelerated curing catalyst. When used with the ZTC777 Hypercure Fast Drying Clear Coat, they reduce through-drying time while retaining measured gloss levels. ZTH770 and ZTH772 may also be substituted for ZTH828 in clear coat and topcoat systems specified for ZTH828, increasing the curing rate of those coatings.
Hardener Series | Drying Grades | Matched Coating |
|---|---|---|
ZTH919 Extra H.S. | K / B / M | ZTC919 High Hardness Clear Coat |
ZTH828 H.S. | K / B / M | ZTC828 H.S. High Gloss Clear Coat |
ZTH282 High Performance | K / B / M | ZUOTONG 2K Topcoat |
ZTH393 | K / B / M | ZTC393 Golden Clear Coat, ZTX9300 High Performance Matting Clear Coat, matting color paints |
ZTH878 / ZTH868 Super Fast Drying | Winter (878) / Summer (868) | ZTC878 Super Fast Drying Clear Coat |
ZTH770 Hypercure | Winter grade | ZTC777 Hypercure Fast Drying Clear Coat (70 Kit) |
ZTH772 Hypercure | Summer grade | ZTC777 Hypercure Fast Drying Clear Coat (72 Kit) |
Polyisocyanate hardeners react with atmospheric moisture. Exposure to water can cause thickening, crystallization, gelation, or loss of curing activity. After each use, the container must be resealed immediately and the lid checked for tightness.
Available pack sizes: 0.5L×12/CTN, 1L×12/CTN, 2.5L×4/CTN. Store in a cool, dry, well-ventilated area between 5°C and 25°C. Shelf life is 2 years in unopened original containers stored under recommended conditions.
This product is intended for use by trained professional applicators. Wear appropriate personal protective equipment, including nitrile gloves, safety goggles, and respiratory protection, during mixing and spraying. Observe fire-prevention measures during use and storage. Keep containers out of reach of children.
No. Each hardener series is formulated to match a specific resin system. Using ZTH828 with ZTC919 may alter curing speed, film hardness, or gloss. Refer to the compatibility table and select the hardener series specified for your clear coat.
Select the grade based on the workshop ambient temperature at the time of spraying. Use K below 18°C, B between 18°C and 30°C, and M above 30°C. Using the wrong grade can cause solvent entrapment, pinholing, or extended curing times.
Cloudiness or crystallization indicates moisture contamination. The product should not be used, as it may fail to cure properly or produce surface defects. Discard the material and open a fresh container.
ZTH770 and ZTH772 may be substituted for ZTH828 only in clear coat and topcoat systems explicitly designated for ZTH828 hardener. This substitution increases curing speed. Always conduct a test panel before full application.
