A humidity sensor, coated with conformal coating, will simply not function properly. If you need conformal coating on your PCB, most sensor manufacturers will

A humidity sensor, coated with conformal coating, will simply not function properly. If you need conformal coating on your PCB, most sensor manufacturers will recommend you to cover the top of the sensor with some material (for example, Kapton tape), apply conformal coating to the PCB, and then remove the tape.