The correct technique for applying conformal coating by brush is to flow the coating on.
The material should not be brushed on like you are decorating with paint.
The coating should be loaded on to the brush and flowed onto the printed circuit board.
What conformal coatings can be applied by brush?
All conformal coatings can be applied by brush. Most conformal coatings lend themselves well to the technique.
Key factors that
The key points to be aware of are the material pot life and the conformal coating viscosity.
Material pot life
The pot life of the material may be finite so the conformal coating could cure during use. This may make the material useless to apply after a certain amount of time.
Conformal coating viscosity
The way the conformal coating flows is critical when applied by brush coating.
Therefore, the viscosity of the coating material is highly influential on the flow so control of the viscosity is critical to allow good coverage.
A highly viscous coating will be harder to apply correctly than a lower viscosity material.
What factors control the quality of conformal coating finish with brushing?
Key variables that influence the quality of the process include:
- Operator skill
- Quality of the brush
- Viscosity of the coating
- The coating environment
- Complexity and size of the board
- Conformal coating material type
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