2.4.1 Coating Replacement, Solder Mask
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This method is used to replace solder mask or coatings on circuit boards. Most replacement coatings can be applied by dipping, brushing or spraying.
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If needed, apply tape to outline the area where the solder mask will be applied.
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Apply the replacement coating to the board surface as required. A brush or foam swab may be used to apply and spread the epoxy or replacement coating.
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Outline
This method is used to replace solder mask or coatings on circuit boards. Most replacement coatings can be applied by dipping, brushing or spraying.
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Minimum Skill Level - Intermediate
Recommended for technicians with skills in basic soldering and component rework, but may be inexperienced in general repair/rework procedures.
Conformance Level - High
This procedure most closely duplicates the physical characteristics of the original, and most probably complies with all the functional, environmental and serviceability factors.
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| Tools and Materials
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Cleaner
General purpose cleaner for removing contamination.
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Cleaning Brushes
Disposable brushes for use with solvents for cleaning and application of coatings.
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Coatings
Replacement soldermask and conformal coatings.
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Color Agents
Use to tint the color of epoxy used for solder mask repair or circuit base board repair.
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Foam Swab
Ideal for absorbing cleaning solvents, and applying color agents and epoxies.
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Microscope
Precision microscope with stand and lighting for work and inspection.
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Oven
General purpose oven for drying, baking and curing epoxies.
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Wipes
Nonabrasive, low-linting wipes for cleanup.
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Images and Figures
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| Soldermask Required At Outlined Area |
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| Figure 1: For large surfaces, apply the replacement coating with a foam swab to create a texture. |
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Procedure
- Clean the area.
Caution
Surfaces to be coated must be thoroughly cleaned prior to coating to ensure adequate adhesion, minimized corrosion, and optimized electrical properties.
- If needed, apply High Temperature Tape to outline the area where the solder mask will be applied.
- Mix the epoxy or replacement coating. If desired, add color agent to the mixed epoxy to match the circuit board color.
- Apply the replacement coating to the board surface as required. A brush or foam swab may be used to apply and spread the epoxy or replacement coating. (See Figure 1)
- Cure the epoxy per Procedure 2.7 Epoxy Mixing and Handling.
Caution
Some components may be sensitive to high temperature.
Evaluation
- Visual examination for texture, color match, adhesion and coverage
- Electrical tests to conductors around the repaired area as applicable.
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Procedure for reference only.
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Related Products
115-1322 Circuit Bond Kit
Kit containing packages of clear, low viscosity, superior strength epoxy for circuit board damage repair.
Color Agents
One part, air-drying, semi-paste ink for printing on hard surfaces and used to tint the color of epoxy.
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Customer Comments
"I just wanted to let you know, the 10 circuit boards that you touched up in the BGA area, all worked well. Thank you for your help. This is one happy customer."
G.C. Lowell, MA USA
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