Printed Board Type: R/F/W/C
Skill Level: Intermediate
Conformance Level: High
Revision: D
Revision Date: Coating Replacement, Conformal Coating, Encapsulant

OUTLINE
This method is used to replace conformal coatings and encapsulants on circuit boards.

Conformal Coating Required At Outlined Area

PROCEDURE

1. Figure 1: For large surfaces, apply the replacement coating with a foam swab to create a texture.

   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 Kapton tape to outline the area where the coating will be applied.
   
   
3. If required, bake the circuit board prior to the application of the replacement coating.
   
   
4. Mix the replacement coating.
   
   

5. Figure 2: Coating complete.

   Apply the replacement coating to the board surface as required. A brush or foam swab may be used to apply and spread the replacement coating. (See Figure 1).
   
   
6. 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.