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Z900S 1K Primer Surfacer is a nitrocellulose-based, single-component grey primer formulated for automotive refinishing and light industrial coating applications. Designed for automotive repair shops, fleet maintenance centers, and commercial body shops, this intermediate primer fills sanding marks and minor surface imperfections while providing a barrier layer between the substrate and subsequent topcoat. As a cost-effective option for spot repairs and panel touch-ups, Z900S is intended for small-area application where fast drying and ease of sanding are operational priorities.
Multi-substrate adhesion: Bonds to aged and fresh paint films, PP, PA, PVC, ABS plastics, and sanded metal surfaces.
Sanding-friendly finish: Air-dries to a sandable surface within 20 minutes at 25°C, reducing wait time between coats.
Filler capability: Levels 400# to 600# sandpaper scratches and minor dents without requiring a separate putty layer for shallow defects.
Single-component convenience: Requires no hardener activation; mixed with thinner only, simplifying inventory and reducing waste from unused activated material.
Grey tone: Provides a neutral base that supports consistent color perception of subsequent basecoat layers.
Condition | Dust Free Time | Hard Drying (sandable) Time |
|---|---|---|
Room Temperature (25°C) | 10 MIN | 20 MIN |
Baked (60°C) | 5 MIN | 10 MIN |
Parameter | Value |
|---|---|
Component System | 1K (single component) |
Base Resin | Nitrocellulose acrylic |
Color | Grey |
Mixing Ratio by Weight | Z900S : ZK103B Thinner = 1 : 1–1.5 |
Recommended Nozzle Size | 1.5–1.7 mm |
Spray Air Pressure | 1.8–2.5 bar (26–36 psi) |
Pot Life | Use promptly; stir thoroughly if stored beyond 1 hour |
Shelf Life | 2 years (unopened original packaging) |
Prepare the substrate by dry-sanding with 400# to 600# abrasive paper. For plastic components (PP, PA, PVC, ABS), clean the surface with a degreasing agent and scuff lightly to promote mechanical adhesion. Metal substrates should be sanded with 600# paper and wiped free of dust before application.
Combine Z900S with ZK103B Universal Thinner at a weight ratio of 1 : 1–1.5. Stir thoroughly until homogeneous. Use a gravity-feed spray gun with a 1.5–1.7 mm nozzle set to 1.8–2.5 bar (26–36 psi). Apply two medium-wet coats, allowing a 5-minute flash-off interval between coats at 25°C. For plastic repairs, apply the first coat as a thin tack layer and extend the flash-off time to prevent solvent entrapment.
At 25°C ambient temperature, the primer reaches dust-free state in 10 minutes and becomes sandable in 20 minutes. Force-drying at 60°C reduces these times to 5 minutes and 10 minutes respectively. Note that this single-component primer is recommended for small-area repairs only; for large-area applications requiring enhanced corrosion resistance and adhesion, select the Zuotong Z9010 or Z9080 two-component primer surfacer system.
Z900S is designed for use within the Zuotong automotive refinishing system. It pairs with ZK103B Universal Thinner as its designated reducer. Suitable substrates include aged and fresh paint films after dry sanding, PP, PA, PVC, ABS plastics, and metal substrates prepared with 600# sandpaper. Avoid thinners with high water content or excessively fast evaporation rates, as these may induce cracking or film defects.
Z900S is supplied in 3.75 L cans, with 4 cans per carton. Store in a cool, dry, and well-ventilated area away from direct sunlight and ignition sources. The product retains a 2-year shelf life when kept in unopened original packaging. This product is intended for professional use only; operators must wear appropriate personal protective equipment and observe fire-safety precautions during handling and storage.
No. Z900S is formulated for small-area spot repairs and panel touch-ups. For full-vehicle or large-area applications requiring higher adhesion and corrosion protection, Zuotong recommends the Z9010 or Z9080 two-component primer surfacer systems.
Use ZK103B Universal Thinner at a mixing ratio of 1 : 1–1.5 by weight. Avoid thinners with high water content or fast-drying formulations, as these can cause cracking and other film defects.
At 25°C room temperature, the primer is sandable after 20 minutes. At 60°C forced drying, the sandable time is reduced to 10 minutes. Dust-free time is 10 minutes at 25°C and 5 minutes at 60°C.
