Stainless steel diamond plate paint

Hi all, I have a piece of stainless diamond plate that is outdoors. It gets very hot so I am trying to coat it with something. The closest I'm getting to find something that sticks properly is a self etching primer. However, when I paint over that, it's still not sticking. I've tried elastomeric roofing paint, appliance paint, high heat paints, ect, but none will stick. This is a high traffic area also. Does anyone have an idea on what I can use for this? Many thanks in advance!