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DRV8703D-Q1: how to improve conformal coating

Part Number: DRV8703D-Q1

Hi Team, 

my customer has issues with conformal coating. As you can see in the picture in the red circles 

only the left upper device has a appropriate coating. On the rest of the parts, the paint has retreated after painting. 

The customer told me, that he is not able to clean the PCB after mounting, because of the some coils on the opposite side of the PCB. 

Can you give some advise how to improve the adhesion.