What are the minimum order quantity and delivery cycle?

Standard products min 1kg, bulk 20kg. In-stock ships 48h, custom 3-7 days. Nationwide logistics.

How to get product samples and technical support?

Contact 400-901-0757 or +86-13531350189 for free selection guidance and sample delivery.

What quality certifications do products have?

产品按标准化的来料检验、配方变更、批次留样与出货检验流程管理生产。体系证书、第三方检测报告（耐候、耐温、盐雾、附着力、VOC 等）及 MSDS/SDS 可应客户所在市场的合规要求提供，也可在验厂时现场调阅。

Quick-drying and easy to grind; single fill thickness 3-5mm.

automotive body filler Auto Body Filler

Name: 2K Unsaturated Polyester Atom Gray AT-600 — Kexin New Materials | KeXin New Material
Brand: Kexin New Materials
Availability: InStock

Two-component unsaturated polyester automotive sheet metal filler — sandable in 20-30 minutes

Auto Refinish System is a two-component, high-weather-resistant automotive repair coating system based on acrylic polyurethane resin and aliphatic isocyanate curing agents. It includes a complete set of primer, intermediate primer (second coat), color coat (solid/metallic/pearl), and clear coat. The coating achieves a DOI > 85, meeting automotive Class A surface standards, and is precisely tinted according to the original manufacturer's color code (ΔE).<1.0，CIELABStandard），QUV 2000h保光率≥90%。Drying conditions60°C×30min或Room temperature24h——大幅Shorten the delivery cycle。Meets4S Dealership/General repair garage/Body & PaintCenter对AutomotiveAfter-SalesRefinishing和full vehicle refinishing的Coating Application需求。

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DOI>85

Distinctness-of-Image Class-A surface

ΔE<1.0

Precise tinting to OEM colour code

≥90%

QUV2000h light retention rate

0 Grade

Cross-cut adhesion

2KSystem

Two-component PU coating

60°C×30min

Fast-cure process

RALFull colour range

Solid / metallic / pearl

5~40°C

Application ambient temperature

GB24409

Automotive coating standards

Product Overview

ProductsOverview

Product overview: who is it for? what problem does it solve?

Automotive putty is an aftermarket repair coating that provides 4S stores, comprehensive auto repair shops, and body and paint centers with the same appearance quality as the original car paint.The core problem it solves is that after a car is repaired due to a collision/scratch, the color, gloss, and texture of the repaired area must be completely identical to the original paint (no color difference) – meaning that non-automotive paint professionals simply cannot distinguish the repair marks. Kexin Automotive Atomic Putty System precisely matches the original manufacturer's color code (OEM Color Code), ΔE<1.0（CIELABColor Difference公式，人眼无法分辨），DOI>85 (meets automotive Class A surface standards), 60°C x 30 min rapid curing – helps repair shops shorten delivery time from 3 days to 1 day.

Product system:automotive body filleris a complete coating system — not a single product. It includes: ① Epoxy Primer (provides adhesion + rust prevention, suitable for carbon steel/galvanized sheet/aluminum alloy/plastic substrates) → ② PU Primer-Surfacer (fills sanding marks and micro-pinholes after putty sanding, provides a smooth substrate) → ③ Basecoat/Topcoat (solid/metallic/pearl three series, providing color and decorative effects) → ④ 2K High-Solids Clearcoat (protective clear coating + mirror gloss DOI>90, aliphatic curing agent for non-yellowing). Intercoat adhesion Class 0 (cross-cut ISO 2409). The 2K system forms a three-dimensional network structure through isocyanate-hydroxyl crosslinking — the cured coating resists gasoline/engine oil/brake fluid/cleaner (24h each, no abnormality).

Industry background:According to statistics from the China Association of Automobile Manufacturers, China's car ownership reached 340 million vehicles in 2024—resulting in over 200 million bodywork repairs annually due to traffic accidents and scratches. The automotive putty market is approximately 12 billion yuan per year. Traditional solvent-based repair paints have VOC levels exceeding 500g/L—environmental restrictions have been implemented in many regions (Beijing, Shanghai, and Shenzhen have banned the use of solvent-based repair paints in 4S stores). Kexin water-based automotive putty series has VOC...<100g/L——Meets最严格的地方Environmental complianceStandard。

Features

ProductsFeatures

1. Precise color matching based on original factory color code (ΔE)<1.0）

Using a computer-aided color matching system (X-Rite MA-5 spectrophotometer and color matching software), the color is precisely adjusted according to the original OEM color code of the automobile—ΔE.<1.0（CIELABStandard，D65/10°光源）。覆盖全球主流Brand（奔驰/宝马/奥迪/大众/丰田/本田/通用/福特等）近10年的ColorFormulaDatabase——含素色/Metal Flash/珍珠三大colour range，30000+Formula。Metal漆的随角异色Effect（Flop Index）passedaluminium paste/云母Pearlescent pigmentParticle size和排列控制——Ensures与车身原漆在任何观察角度下无Color Difference。

2. Class-A surface · mirror gloss (DOI>85)

Coating DOI (Distinctness of Image) > 85 – Meets automotive Class A surface standards (equivalent to the quality of a new car's factory paint). 2K high-solids clear coat 60° gloss ≥ 95 GU – Full, mirror-like coating. Aliphatic isocyanate (HDI trimer) curing agent – No yellowing (QUV 3000h ΔE)<3.0）。CoatingGasoline Resistant/engine oil/刹车油/洗车液（各No abnormalities in 24 hours）——Meets日常用车Environment中的所有Chemical product identification接触。

3. Quick drying, shortening delivery cycle

Baking at 60°C for 30 min accelerates curing — the clearcoat can then be polished. At room temperature (23°C) it is tack-free in ≤30 min and through-hard in ≤4 h — enabling “spray in the morning, deliver in the afternoon” express repairs. Fast-dry clearcoat formulations can be polished 2-4 h after spraying without sticking to the polishing pad. This matters greatly to 4S dealerships and express-repair chains: delivery time shrinks from the 2-3 days of conventional refinish paints to within one day.

4. Complete package, one-stop supply

From sheet-metal putty → epoxy primer → PU primer surfacer → basecoat → 2K clearcoat — the complete matched system is supplied by Kexin. Interlayer adhesion is grade 0 (ISO 2409) — recoating without sanding. It is also compatible with equivalent products of mainstream brands (BASF Glasurit/PPG Nexa Autocolor/Axalta Spies Hecker) — 4S dealerships can switch suppliers flexibly without changing process flow.

5. Environmentally compliant, water-based/solvent-based dual series

Waterborne series VOC<100g/L——Meets北京/上海/深圳等城市禁止4S DealershipUseSolvent typeRepair paint的Environmental compliance法规。Solvent typeSeriesVOC<420g/L——Compliant with GB 24409-2020《Automotive coatings中有害substance限量》。两个Series均passedROHS和REACH-compliantTesting。Water-BasedMetal漆/珍珠漆的Color鲜艳度和Effect不亚于Solvent type。

6. Suitable for multiple substrates; excellent adhesion.

The epoxy primer achieves grade-0 adhesion on many substrates common in automotive manufacturing: carbon steel, galvanized sheet, aluminum alloy and plastics (PP/ABS/PC). The PP primer dedicated to plastic bumpers can be sprayed directly without flame or corona treatment. For aluminum bodies (increasingly common on new-energy vehicles) — epoxy primer + PU surfacer + basecoat + clearcoat — the complete system delivers grade-0 adhesion.

Technical Specifications

TechnicalParameters

System parameters

Product systemPrimer + Intermediate Primer + Color Paint + Clear Varnish (4-layer system)

Resin typeAcrylic polyurethane (basecoat/clearcoat) + epoxy (primer)

Hardener typeAliphatic HDI trimer (non-yellowing)

Volume solidsPrimer ≥ 65% / Intermediate coat ≥ 60% / Clear coat ≥ 60%

Colour systemSolid colors/metallic shimmer/pearl 30000+ formula

Mixing ratio (varnish)Main agent: curing agent: diluent = 2:1:0.3

Pot life2h(23°C)

Recommended DFTPrimer 50μm + Intermediate coat 60μm + Color coat 20μm + Clear coat 50μm

Drying conditions60°C for 30 minutes or at room temperature for 24 hours

VOC contentSolvent type<420/Water-Based<100 g/L(GB 24409)

Performance

DOI vividness>85 (Class-A surface)

Gloss (60°)Clear varnish ≥95GU / Color paint as needed

Cross-cut adhesionLevel 0 (ISO 2409:2020)

Color difference ΔE<1.0（CIELAB D65/10°）

QUV light retention rate≥90%（2000h，ISO 16474-3）

Resistant to gasoline (92#)No abnormalities in 24 hours

Impact resistance≥50 kg·cm

Pencil hardnessClear varnish ≥ H / Color paint ≥ HB

Applicable substratesCarbon steel / galvanized sheet / aluminium alloy / PP / ABS / PC

Application Process

ApplicationProcess

Sheet metal repair + cleaning

Sheet metal repair → Grinding feathered edges (P80-P180) → Cleaning and degreasing (degreaser + dust cloth). Bare metal areas need to be sprayed with epoxy primer for rust prevention. Plastic parts are treated with PP primer.

Atomic putty + intermediate primer

Apply unsaturated polyester putty to the recessed area (sanding can be done after 20-30 minutes) → sand smooth in stages from P180 to P320 → spray 2-3 coats of PU intermediate primer → wet sand at P400-P600 after drying.

Basecoat spraying

Accurately weigh and mix the color according to the formula → apply 2-3 coats of color paint (with a 5-10 minute flash-dry interval between each coat) → spray the solid color paint directly → for metallic paint, control the spraying technique (air pressure/spray distance/gun speed) to ensure uniform aluminum powder distribution.

Clearcoat gloss-over

2K high-solids clear varnish in 2 coats (first coat semi-wet → flash dry for 5-10 min → second coat fully wet) → bake at 60°C for 30 min to accelerate curing (or at room temperature for 12 h) → polish after drying.

Polishing + Inspection

P1500-P3000 sandpaper wet sanding to remove dust spots → three-step polishing with coarse wax + fine wax + mirror wax → inspection of DOI/gloss/color difference/adhesion → cleaning and delivery. Quality requirements: no color difference and no repair marks visible from a distance of 1m.

Applications

ApplicationsField/Area

4S store body and paint center

Brand-authorized / express-repair production line

General repair garage

Multi-brand general refinish

Full-vehicle respray / colour change

Classic-car refurbishment / custom colour change

Commercial-vehicle refinish

Trucks / buses / construction vehicles

Sheet-metal repair

Accident vehicle bodywork and painting

Plastic bumper spraying

PP/ABS plastic parts

Wheel / rim refurbishment

Aluminium-alloy wheel repair and repaint

Express-repair chain

Small-area fast repair

New-energy vehicles

Aluminium-alloy body repair

Spray-training centre

Vocational schools / training centres

Car modification

Personalised / motorsport livery

Export auto-repair market

Southeast Asia / Middle East / Africa

FAQ

Frequently AskedFAQ

OEM paint requires baking at 140-160°C for 20-30 min to cure fully — because on the OEM paint line the body is only a bare metal shell (no interior, electronics or tires) and can go into a high-temperature oven. Refinish paint, however, must cure at low temperature (60°C or room temperature) — because a complete vehicle (interior, electronics, fuel lines) cannot withstand temperatures above 80°C. Refinish paints therefore use more chemically reactive hardeners (fast-crosslinking HDI trimers) — achieving hardness/adhesion/weathering resistance equal to OEM paint at lower temperatures. Refinish formulations are purpose-designed — the goal being “cure 100°C lower without losing performance”.

Accurate matching steps: ① Find the vehicle body color code (usually on the label in the engine compartment/door frame/B-pillar, such as "197U" for Mercedes-Benz and "A96" for BMW); ② Enter the code into the customer information color database → the system provides the formula (including the proportions of all color masterbatches); ③ Prepare a 50g sample → compare it with the vehicle body under standard lighting (D65) and side lighting (A light source); ④ If minor adjustments are needed → use color matching software to calculate the correction amount → re-mix → until ΔE is achieved.<1.0。Color Difference产生的Main cause：①不同批次Original paint本身有微小Color Difference（OEM允许ΔE<2.0的批次差异）；②Metal漆的aluminium paste排列受Spray coating手法影响（Air pressure / spray distance / gun speed改变aluminium pasteOrientation→影响随角异色Effect）；③车身旧漆因UV老化已变色（Red/Yellow最明显）——Refinishing时需刻意微调Color matching已老化车身。

1K clear coat = single-component, relies on solvent evaporation for physical drying—the coating merely "dries" without undergoing chemical crosslinking—resulting in poor solvent resistance, hardness, and durability (softens when exposed to gasoline). 2K clear coat = two-component (base + hardener), where isocyanate (-NCO) undergoes a chemical crosslinking reaction with hydroxyl (-OH) groups in the base—forming a three-dimensional network structure—so that even after curing, it does not soften when immersed in gasoline. The hardness of 2K clear coat (≥H vs. 1K's

Advantages of water-based paint: ① VOC<100g/L——Meets北京/上海/深圳等城市禁止4S DealershipUseSolvent typeRepair paint的Environmental compliance法规（法规驱动是最大因素）；②Metal漆/珍珠漆的Color鲜艳度和随角异色EffectSuperior ToSolvent type——尤其ForPremium车（奔驰/宝马）的Metal漆——water-based paint的aluminium paste排列更均匀；③不Flammable——water-based paint不属Danger品（UN1263豁免）——Storage/TransportCost更Low.Solvent type漆的Advantages：①Application宽容度大——对温HumidityLow（water-based paintRH>① Drying is extremely slow at 75% concentration; ② Drying is fast – solvent-based paints can be flash-dried in 5-10 minutes before applying a clear coat, while water-based paints require 15-20 minutes plus infrared pre-drying; ③ Minimal investment in retrofitting existing equipment (solvent-based equipment can be used directly). Trend: The EU/North America has mandated water-based paints (driven by regulations), and first-tier cities in China are rapidly switching to this method.

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Automotive puttyFactory direct supply

Free sample testing · Precise color matching with original factory color codes · Technical training support · 48-hour rapid response

Free sample testing

Colour formula support

Fast dispatch within 48 hours

Technical training

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