I got a bunch of 15 year old combo style motor starters on the roof. Many of them suffer from condenstation. It forms on the top and drips onto the contactor causing rust. The rubber gasket around the doors are in pretty bad shape. There is a metal lip around the door to keep rain out.

They are fed with sealtite from the bottom.

I am not sure what causes the condenstion.

Any ideas on what can be done?