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Dunk.
If you can lay your hands on a can of PCB spray protector from JayCar or similar, this will solve most of the issues. A squirt on the PCBs close to the cooling source.
A simple way to reduce condensation is to leave some bare metal exposed to the air outside the camera. Strangely, this works quite well. I leave the back of the Aluminium mounting bracket uncovered; that is, the bracket that holds the TEC, copper finger and heatsink in place, all clamped together. Despite the rubber sheet insulation it gets quite cold.
So rather than seal in, leave them exposed to the air.
If you have done all of this the spray can is your friend.
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