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ZUOTONG 2K Topcoat is a two-component acrylic polyurethane solid-color topcoat designed for automotive body repair and commercial fleet refinishing. The product is formulated with solid-color tinters and a blending resin, producing a finish with measured hiding power, color consistency, and weather resistance when cured with the matched ZTH828 series hardener. The topcoat is part of the ZUOTONG mixing system and can be tinted to reproduce a full range of automotive solid colors.
The topcoat formulation uses high-load pigment dispersions to achieve coverage over prepared primer surfacer in 2 to 3 spray coats. Color reproducibility is controlled through standardized tinter ratios within the ZUOTONG mixing system, supporting consistent color match across repair batches.
Once fully cured, the 2K topcoat film provides resistance to UV degradation, moisture, and common automotive chemicals including diesel and mild detergent solutions. The cured film maintains gloss and color retention under normal outdoor exposure conditions.
The cross-linked polyurethane film delivers measured hardness and adhesion to properly prepared primer surfaces. The coating is suitable for exterior body panels and, when used with a flex additive over plastic primer, for flexible plastic components such as bumpers and trim.
The mixing ratio by volume is 2 parts 2K Topcoat : 1 part hardener : 0.2-0.4 parts thinner.
Temperature Range | Recommended Hardener | Recommended Thinner |
|---|---|---|
Below 18°C | ZTH828K | ZK301K |
18-30°C | ZTH828B | ZK301B |
Above 30°C | ZTH828M | ZK301M |
Pot life after mixing at 25°C: approximately 4 hours
Spray gun type: gravity-feed
Nozzle caliber: 1.2-1.4 mm
Spray pressure: 1.8-2.5 bar
Number of coats: 2-3
Flash-off time between coats: 5-10 minutes
Drying Condition | Dust-Free Time | Polishing Time |
|---|---|---|
Room temperature (25°C) | 30-40 min | 10-14 hours |
Baked (60°C) | 5-15 min | 40-50 min |
Apply the topcoat over primer surfacer surfaces that have been abraded with 600#-1000# grit sandpaper. The surface must be clean, dry, and free of rust, scale, and previous coating failures.
Remove wax, oil, silicone, and other contaminants using a compatible degreaser. Wipe the surface with a lint-free cloth and then with a tack cloth immediately before spraying.
When spraying over flexible plastic parts, apply a suitable plastic primer first. A flex additive may be incorporated into the topcoat mixture to improve film flexibility and prevent cracking under deformation.
Available packaging: 1L×12/CTN, 3.75L×4/CTN.
Store in a cool, dry, well-ventilated area between 5°C and 25°C. Keep containers tightly sealed when not in use. Shelf life is 2 years in unopened original containers.
Stir the topcoat thoroughly before mixing to ensure pigment dispersion and color accuracy. For any repolishing or further repair work, wait until the paint film has reached full cure. Partial cure can cause sanding marks to show through the new coating.
Mix 2 parts topcoat, 1 part ZTH828 series hardener, and 0.2-0.4 parts ZK301 series thinner by volume. Adjust thinner content within the range based on ambient temperature and spray viscosity.
At 25°C, the mixed material has a pot life of approximately 4 hours. Beyond this time, viscosity increases and the material may not spray correctly. Discard unused mixed material and prepare a fresh batch.
No. Apply the 2K topcoat only over properly prepared primer surfacer. Bare metal requires an appropriate primer or primer surfacer before topcoat application to ensure adhesion and corrosion protection.
At room temperature (25°C), allow 10-14 hours before polishing. If force-dried at 60°C, polishing can begin after 40-50 minutes. Always confirm the film is fully cured before compounding or polishing.
Yes. When spraying over flexible plastic components coated with plastic primer, incorporate a compatible flex additive into the topcoat mixture. This reduces the risk of cracking when the plastic flexes under normal use.
