Selective Robotic Conformal Coating: Best Practices

Selective robotic conformal coating uses programmable spray systems to apply material only where required, reducing masking, saving coating material, and increasing repeatability. This article explains the best practices, advantages, and common pitfalls when moving from batch coating to robotic selective processes.

Infographic comparing selective robotic conformal coating with batch spray and dip methods, showing advantages and challenges for PCB protection.

What is Selective Robotic Conformal Coating?

A selective conformal coating process uses a programmable XYZ robotic platform fitted with precision spray or film valves. The system deposits coating only on programmed PCB areas, removing much of the masking required in traditional dip or batch spray methods.

Advantages of Selective Robotic Coating

  • Reduced masking: Less or no masking lowers labour cost and rework risk.
  • Consistency: Highly repeatable process ensures uniform film thickness batch to batch.
  • Less skilled labour needed: Operators only load/unload boards; application is automated.
  • Reduced finishing: Minimal defects such as tears, lifting, or masking residue.
  • Material efficiency: Sprays only the required area, saving coating material.

Challenges and Considerations

  • Masking may still be needed: Connectors and sensitive areas can still require masking to prevent wicking.
  • Component alignment: Misaligned or tall 3D parts may interfere with the spray head path.
  • Edge coverage: Complete coverage of PCB edges can be difficult without specialised settings.
  • Board handling: PCBs must be rigid enough for machine jigs and rails.
  • Programming setup costs: Initial programming requires investment, amortised across production runs.

Find out more about choosing the right conformal coating selective valve technology here.

Best Practices for Successful Implementation

  • Perform a detailed Design for Coating (DFC) review before programming.
  • Validate edge coverage and 3D component coating paths during setup.
  • Maintain regular calibration and cleaning of valves to prevent blockages.
  • Amortise setup costs by standardising PCB designs where possible.

Need Help with Robotic Conformal Coating?

Our team offers selective robotic coating, batch spray, and dip coating services, as well as equipment and training. Let us help you choose the right process for your boards.

Contact Our Experts

Why Choose SCH Services?

Partnering with SCH Services means more than just outsourcing — you gain a complete, integrated platform for
Conformal Coating, Parylene & ProShieldESD Solutions, alongside equipment, materials, and training, all backed by decades of hands-on expertise.

  • ✈️ 25+ Years of Expertise – Specialists in coating technologies trusted by aerospace, medical, defence, automotive, and electronics industries worldwide.
  • 🛠️ End-to-End Support – Guidance on coating selection, Parylene grades, masking strategies, application methods, inspection, and ProShieldESD integration.
  • 📈 Scalable Solutions – From small prototype batches to full-scale, high-volume production, SCH delivers flexible capacity that grows with your needs.
  • 🌍 Global Reach – Responsive technical support and supply coverage across Europe, North America, and Asia.
  • ✅ Proven Reliability – A strong reputation built on quality, consistency, and customer satisfaction across services, equipment, and materials.

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