I've painted a few and they've turned out great. Lasted a long time.
I started by using a 3M scotch pad or scuff pad. I went in all directions to make sure I got all sides of the diamond embossing. Then I wiped the entire box down with paint reducer to clean everything.
Then I used Rust-oleum paint. I used flat black. I put on a light coat at first and then thicken it up. You have to paint the box like you would a car. So start from side and work to the other side. Or you'll get build ups..
As for primer there is really no need for it.
I started by using a 3M scotch pad or scuff pad. I went in all directions to make sure I got all sides of the diamond embossing. Then I wiped the entire box down with paint reducer to clean everything.
Then I used Rust-oleum paint. I used flat black. I put on a light coat at first and then thicken it up. You have to paint the box like you would a car. So start from side and work to the other side. Or you'll get build ups..
As for primer there is really no need for it.