Potting inside of the Wall plug Power Supplies

[elefurtronik]

Hello,
Is it logic to add potting inside of the wall plug power supply if it is working in a humid area? Do I see any issue if I add potting material on the circuit?

[jpanhalt]

Potting can decrease thermal conductivity between the circuit elements and room air.  Your circuit would run hotter.  Since wall warts are designed to be as cheap as possible, there may not be much thermal margin.  There are non-electrically conductive and highly heat conductive materials (e.g., epoxy-BN mixtures), but I would probably just insure everything was well protected with conformal coating.  For BN-epoxy, see example here: https://www.mdpi.com/2073-4360/11/4/597/pdf