LEt me help you with this. My company used to build control boxes for motorcycles. They were similar to what you are doing.
The first thing is the epoxy is like water in that it will find ANY joint or opening to run out of. Second is ANY stranded wire going into the enclosure will wick water into the enclosure and your epoxy.
Third thing is air bubbles. When adding epoxy, do it slowly and move the enclosure around and turn is every way possible to let air escape. Then add more epoxy, and repeat. Let it set a while and repeat, until you have filled the enclosure and all the air bubbles have escaped.
Third, If possible place the completed project in a heated enclosure to speed up the setting of the epoxy.
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