Which underbonnet paint?

[S6 ROR]

The black paint has started comming/flaking off on the underside of my T350 bonnet, so am going ti take it off and re-paint it. I have used Re-Panit Coach enamel satin black in the past, which i got from halfords.
Been in there this morning to get some, and guess what, they haven`t got any.

Any recommendations on what people use would be much appreciated.