Circuit Board Repair Guide > Basic Circuit Board Repair Procedures > 2.4.1 Replace Solder Mask or Coatings on Printed Circuit Boards

Replace Solder Mask or Coatings on Printed Circuit Boards

Repair Circuit Boards | Repair SMT Pads | Repair BGA Pads | Repair Lands | Repair Edge Contacts
Repair a Conductor | Plated Hole Repair | Base Board Repair | Replace Solder Mask or Coatings

Outline
This procedure is used to replace solder mask or coatings on circuit boards. Most replacement coatings can be applied by dipping, brushing or spraying.

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.
 
Solder mask required at outlined area
Solder Mask Required At
Outlined Area

IPC Acceptability References
IPC-A-600 2.0 Externally Observable Characteristics
IPC-A-610 10.0 Laminate Conditions

Related Procedure References
CTC 1.0 Foreword - Circuit Board Repair Guide
CTC 2.1 Handling Electronic Assemblies
CTC 2.2.1 How to Clean a Circuit Board
CTC 2.2.2 Cleaning Circuit Boards, Aqueous Batch Process
CTC 2.3.1 Coating Removal, Identification of Coatings
CTC 2.4.2 Replace Conformal Coatings and Encapsulants on Circuit Boards
CTC 2.5 Baking and Preheating of Printed Circuit Boards
CTC 2.7 Epoxy Mixing and Handling
IPC 7721 2.4.1 Coating Replacement, Solder Mask

Tools and Materials
Alcohol Swabs - Self-saturating Isopropyl alcohol swabs. Squeeze handle to release alcohol.
Circuit Bond Pack - Clear, superior strength epoxy in two-compartment plastic package.
Cleaner - General purpose cleaner for removing contamination.
Cleaning Brushes - Disposable brushes for use with solvents for cleaning and application of coatings.
Coatings - Replacement soldermask and conformal coatings.
Color Agents - Use to tint the color of epoxy used for solder mask repair or circuit base board repair.
Foam Swabs - Ideal for absorbing cleaning solvents, and applying color agents and epoxies.
Microscope - It is a challenge to undertake precision repair without a good microscope.
Oven - General purpose oven for drying, baking and curing epoxies.
Wipes - Nonabrasive, low-linting wipes for cleanup.

2.4.1 Coating Replacement, Solder Mask

Printed Board Type: R/F/W/C  |  Skill Level: Intermediate  |  Conformance Level: High  |  Rev.: D  |  Rev. Date: Jan 5, 1998

Apply replacement coating with foam swab

Figure 1: For large surfaces,
apply the replacement coating
with a foam swab to create a
texture.
1. 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.
 
2. If needed, apply High Temperature Tape to outline the area where the soldermask will be applied.
 
3. Mix the epoxy or replacement coating. If desired, add color agent to the mixed epoxy to match the circuit board color.
 
4. 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).
 
5. Cure the epoxy per Procedure 2.7 Epoxy Mixing and Handling.

Caution
Some components may be sensitive to high temperature.
 
Evaluation
 
1. Visual examination for texture, color match, adhesion and coverage.
 
2. Electrical tests to conductors around the repaired area as applicable.


Special Order. Usually ships within 3 business days from Haverhill, MA, USA. For customer service call 1-519-651-3060.

Import duties and Value Added Tax will be collected at time of delivery for all shipments outside the USA.

2CheckOut (2CO) is a payment facilitator for goods provided by ELAB (Engineering Lab).

How to purchase.                                                           View cart Minimum order $50 + shipping
Image Description Part No., Price and Quantity
Alcohol Swab Alcohol Swabs (package of 50), 235-1000-50

Self-saturating foam swabs filled with 99% Isopropyl alcohol. Ideal for removing flux residue and cleaning surfaces prior to soldering, coating and application of epoxy. Overall Length: 4.125". Squeeze handle until it "pops" releasing alcohol into the tip.

Enlarge
235-1000-50

$39.00 pkg/50

 
Liquid circuit board epoxy Circuit Bond Pack  MSDS, 115-3302

Clear, low viscosity, superior strength epoxy, precisely measured out into a two-compartment plastic package so it's easy to use and there's no measuring (2 gram). Shelf life: 6 months minimum.

Enlarge
115-3302

$12.95 each

 
Cleaning Brush Cleaning Brushes (package of 100), 235-2106-100

Disposable brushes for use with solvents for cleaning and application of coatings.



Enlarge
235-2106-100

$29.95 pkg/100

 
Color Agents for Circuit Boards Color Agent, Green, 115-9348

Use to tint epoxy for solder mask and base board repair. Color agent may also be applied directly to the circuit board surface for color matching. Supplied in 1 oz. (29 ml) collapsible metal tubes. MSDS

115-9348

$19.95 each

 
Color Agents for Circuit Boards Color Agent, Light Green, 115-9358

Use to tint epoxy for solder mask and base board repair. Color agent may also be applied directly to the circuit board surface for color matching. Supplied in 1 oz. (29 ml) collapsible metal tubes. MSDS

115-9358

$19.95 each

 
Foam Swab Foam Swabs, 3/16" Tip (pkg. of 100), 235-2102-100

Foam Swabs have 3/16" tip. Ideal for absorbing cleaning solvents, and applying color agents and epoxies.


Enlarge
235-2102-100

$49.50 pkg/100

 

Products above ship direct from manufacturer and are special order/non-returnable. Will ship within 3 business days.





Links to Related Products


Circuit board epoxy for ciruit repair   Circuit Bond Kit 115-1322: Liquid circuit board epoxy
Circuit Bond Kit contains 10 packages of clear, low viscosity, superior strength epoxy ideal for circuit board use. The epoxy is precisely measured out into two-compartment plastic packages. This adhesive is easy to use and there's no measuring.

Color Agents for Circuit Boards
Matching epoxy to the color of the circuit board being repaired is easy when you use a color agent. Color agents may also be applied directly to the circuit board surface for color matching.


Base Board Repair Kit used to repair damage to base board material   Base Board Repair Kit 201-3110
Most types of damage to base board material can be repaired with this versatile base board repair kit. The kit is industry approved and meets IPC guidelines. The kit includes epoxies and color agents. The high strength, high temperature epoxy withstands demanding physical environments.



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