The trailer battery box was finished this afternoon. I drilled and tapped holes (ie, drilled holes and then threaded them) before applying a bead of Sikaflex around the perimeter of the aluminium shell to create a waterproof seal between the shield and the lid. The lid was then secured with M4 stainless steel machine screws.
The box should now be waterproof.
Then I applied a coating of thick bituminous paint to the steel lid and edges. Hopefully this will prevent the lid from rusting
It doesn’t have to look pretty because the lid will be underneath the trailer floor.
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