Practical Guide
Setting up Graco M2K 6:1 Air-Assist correctly – less waste, more consistent 2K finish
In this guide, you will get a practical overview of the mechanical 2K dosing/mixing system (M2K, fixed mixing ratio 6:1) including guide values from the technical specifications, a professional workflow, and typical error patterns.
Why M2K instead of manual mixing?
M2K is designed to increase mixing accuracy, reduce material loss, and make flushing faster due to its compact design – especially for lower 2K consumption.
For which materials?
According to specifications, M2K is suitable for 2K epoxy, polyurethane, and polyester (typically at lower volumes).
Air-Assist briefly explained
Air-Assist combines fluid pressure with additional atomizing air for good atomization and transfer – especially helpful with varying viscosities.
Product Overview: Variants, Applications, Advantages (Table)
| Variant | Typical Application | Mix Ratio | Spec Guide Values | Daily Advantage |
|---|---|---|---|---|
| M2K 6:1 Air-Assist – Wall Mount Graco 24V891 | Fixed workstation, short distances, standardized processes | 6:1 | Max. working pressure 2400 psi / 163 bar, Fluid/Air Ratio 20:1, Max. flow rate 3500 cc/min, Max. air pressure 100 psi / 7 bar | Constant installation, repeatable settings, less setup time |
| M2K 6:1 Air-Assist – Cart Mount Graco 24V885 (Shop Configuration) | Flexible station, changing booths/workstations | 6:1 | Max. working pressure 3000 psi / 204 bar, Fluid/Air Ratio 20:1, Max. flow rate 3500 cc/min, Max. air consumption (at 20 cpm) 26 scfm, Max. air pressure 100 psi / 7 bar | Mobile, quickly at the application site, ideal for smaller 2K consumption |
Note: Values are guide values from published technical specifications; components/setups may vary depending on the package.
KPI Boxes (3 Items)
6:1
Fixed Mix Ratio
For processes where ratio consistency is more important than frequent retooling.
3500
cc/min Max. Flow (Guide Value)
Helps with stable material supply (depending on material & setup).
20:1
Fluid/Air Ratio (System)
Important guide value for designing compressed air supply and process window.
Practical Tip: When switching between flushing and spraying, plan the sequence so that you have as little mixed material as possible in the system. This reduces flushing waste and saves time – especially with short pot lives.
Ready for the right complete unit?
If you are looking for a mobile 6:1 solution with PerformAA 50 and standard mix manifold, you can find the right configuration directly in the shop.
Recommended Basic Settings (as Guide Values)
- Compressed Air Supply: Plan the system so that the max. air pressure of the system is maintained (Guide value: 100 psi / 7 bar).
- Fluid Side Working Pressure: Limit the process to the respective max. working pressure of the package variant (e.g., Wall Mount 24V891: 2400 psi / 163 bar; Cart 24V885: 3000 psi / 204 bar).
- Flow Rate Window: For process planning, you can use the max. flow rate as an orientation (Guide value: 3500 cc/min for 6:1 Air-Assist variants).
- Air-Assist Fine-Tuning: Always adjust atomizing air and fluid pressure in small steps until atomization and transfer are correct (exact gun values are material and nozzle specific).
- Material Compatibility: M2K is designed for 2K epoxy, PU, and polyester, among others – nevertheless, always check your material's data sheet (pot life, viscosity, temperature window).
Note: These points are deliberately formulated as guide values and are based on published specifications; specific parameters depend on material, nozzle, hose lengths, and application.
Professional Workflow (5–7 Steps)
- Material Check: Check A/B components (expiry date, temperature, viscosity, pot life) and prepare containers correctly.
- Air & Safety: Provide clean/constant compressed air; design the process to comply with system limits (e.g., max. air pressure).
- Priming/Start-up: Start the system and stabilize material flow – the goal is a steady flow rate without air/gas bubbles.
- Ensure Ratio Consistency: With a fixed 6:1 system, the focus is on process stability: constant supply, clean lines, no leaks.
- Adjust Spray Pattern: First adjust fluid pressure for a "clean application", then fine-tune atomizing air for the desired atomization.
- Short Control Runs: Test on a reference part: check surface, flow, mottling/orange peel, edge build-up, and readjust in small steps.
- Planned Flushing: As soon as a break/material change is scheduled, flush quickly and methodically to minimize mixed material in the system.
Troubleshooting (4 Sub-problems + Measures)
1) Streaky / Uneven Spray Pattern
- Adjust atomizing air in small steps (do not "over-blow").
- Stabilize material feed (even flow rate, no air in material).
- Check for wear/dirt on air cap/tip and clean.
2) Orange Peel / Application too Dry
- Fine-tune fluid pressure and air (atomization vs. wet film formation).
- Check material temperature/environment (too cold/too warm changes viscosity & flow).
- Keep application distance and speed consistent.
3) Material Hardens in System / Flushing Effort Increases
- Adjust workflow to pot life: shorter mixing distances/dwell times, avoid breaks.
- Standardize flushing routine (immediately upon interruption, consistent steps).
- For frequent interruptions, plan the process so that as little mixed material as possible remains.
4) Finish Fluctuates / Ratio Suspected
- Check A/B supply (containers, suction hoses, tightness, no bypass air).
- Establish constant operating conditions (compressed air, temperature, material level).
- Document reference setup (nozzle, distance, pressure window) to quickly find deviations.
Maintenance (5 Points)
- Flushing Routine: Flush consistently after the shift ends/material changes – flushing waste decreases when the sequence is standardized.
- Air Quality: Clean, dry compressed air supports process stability and reduces malfunctions.
- Tightness: Regularly check for leaks (suction side, connections, hoses).
- Gun Care: Keep air cap/tip clean; replace wear parts in good time (prevents spray pattern errors).
- Documentation: Record reference setups (material, nozzle, pressure window) as a "recipe" – saves time on repeat orders.
FAQ
1) For which 2K materials is M2K intended?
For lower volumes including epoxy, polyurethane, and polyester – however, the material data sheet is always decisive (pot life, viscosity, temperature window).
2) What are the benefits of Air-Assist compared to "only" Airless?
Air-Assist adds atomizing air to the fluid stream to improve atomization and transfer – helpful for finish requirements and changing viscosities.
3) Which system limits must I absolutely observe?
Primarily max. air pressure (guide value 100 psi / 7 bar) and max. working pressure of the respective package variant. Plan your system so these limits are not exceeded.
4) Why is the flushing strategy so important with 2K?
Because mixed material in the system reacts quickly depending on the pot life. A clear procedure reduces downtime, waste, and solvent consumption.
5) Does the PerformAA 50 suit my finish requirements?
PerformAA is designed for high-quality results and relies on material-specific air caps and fine finish tips. In practice, the combination of material, tip/aircap, and stable parameters decides the outcome.
Conclusion
If you want to move away from manual mixing for 2K applications, the Graco M2K (6:1, Air-Assist) provides a clear advantage: consistent ratio, clean workflow, and less material and cleaning effort. Use the specifications as process guardrails, always tune Air-Assist in small steps – and standardize flushing & reference setups so that quality becomes reproducible.
