Paint suggestions for cat iron please.

[saveasteading]

Hoping to do as few operations to this gutter as possible. A one coat solution would be welcome.

Any suggested products?

I last did that about 10 years ago using something like hammerite. As you can perhaps  see it was onto variously the previous finish, an undercoat, or iron.

Did I do a primer where it was rusty iron? Can't remember, but certainly only if the tin said I had to.

 

Clearly the paint didn't adhere as hoped, or fade as anticipated.

 

So, suggestions for minimal prep, over any surface, in green.  Please. 🤞