Grey sticks out like a sore thumb.

[CalvinHobbes]

How can I turn a plastic adaptable weatherproof box that is grey to be black without paint flaking? We have some black liner that was put under decking, would zip tying it on be insane? (Above a transformer high up)

[Russdl]

I’m not entirely sure I understand the question but if I have got the right end of the stick:

 

We used spray paint that was suitable for plastic on several external power outlets to turn them from grey to black and they remain very black four or so  years later. No sign of flaking.