Conformal Coating Rework Workflow: Clean, Repair, Recoat

The conformal coating rework workflow follows three critical stages: clean, repair, and recoat. Each step is supported by inspection, ESD controls, and documentation to ensure long-term reliability. Following a proven rework workflow helps restore coated PCBs to IPC standards while minimising risks during repair and recoat operations.

Conformal Coating Rework Workflow Quick Links

• 1) Intake & Assessment
• 2) Clean
• 3) Repair
• 4) Recoat
• Inspection & Verification
• Documentation & Release

1) Intake & Assessment in the Conformal Coating Rework Workflow

• Confirm requirements, keep-outs, thickness targets, and acceptance criteria.
• Identify coating type and affected areas (use UV inspection to map coverage).
• Select removal method: wet strip or micro-abrasion.
• Enable ESD controls (grounding, mats, wrist straps, packaging).

2) Clean

• Remove debris; mask sensitive zones with masking tapes & dots or reusable boots.
• Apply solvents/aqueous cleaners; inspect under UV/white-light booths.
• Rinse/dry carefully to prevent dewetting or ionic corrosion.

3) Repair Stage

• Selective coating removal: micro-abrasion (Parylene) or removal chemicals.
• Component rework/replace; confirm pad integrity under digital microscopes.
• Local coating repairs; feather edges to prevent delamination.

4) Recoat Stage

• Remask keep-outs; confirm edge quality with UV inspection.
• Reapply coating (spray, selective, dip) to target thickness.
• Cure per datasheet; avoid orange peel or pinholes.

Inspection & Verification in the Rework Workflow

• Coverage: verify under UV; check edges.
• Thickness: measure with eddy-current gauges or optical meters; manage plans per AQL, coupons, SPC.
• Record results; confirm against NASA workmanship standards.

Documentation & Release

• Log rework details: removal method, materials, operators, lot codes.
• Attach inspection data and sign-off to IPC class.
• Use ESD-safe packaging and label rework lots clearly.

Summary

The conformal coating rework workflow — clean, repair, recoat — ensures assemblies meet IPC and customer standards. By combining robust inspection, ESD protection, and documentation, reworked PCBs achieve reliable performance and long-term compliance.

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 worldwide.
• 🛠️ End-to-End Support – Guidance on coating selection, Parylene grades, masking, inspection, and ProShieldESD integration.
• 📈 Scalable Solutions – From prototype batches to high-volume production, SCH grows with your needs.
• 🌍 Global Reach – Responsive support across Europe, North America, and Asia.
• ✅ Proven Reliability – Built on quality, consistency, and customer satisfaction.

📞 Call: +44 (0)1226 249019
✉ Email: sales@schservices.com
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