That annoyed me too when I looked at it. Since it's cast metal, I can't really think of a way to recreate it. I could sand that section completely smooth and repaint it. But, I think I will just end up living with it as is. I honestly thought it would be easier to feather in the areas where the paint was removed, in both the aluminum and steel parts. It just isn't working out that way. In the end, I have to set my personal desire for perfection aside. It doesn't help that I am dong this while watching some car show on Velocity where they talk about perfectly smooth paint jobs. It's a grill, not a car. I just have to repeat that to myself.
You could simply use crinkle finish paint
I don't think it would handle the heat since it is the firebox. The cart parts I want to be smooth and glossy. Well, about as smooth and glossy as I can get while spraying in a garage using rattle can paint.
This kind of brings up a question that has been eating at me. High heat paint, Is it just a question of paint sticking to the metal ? Would it work to lay down a nice base coat of High Heat, but then top coat that with some other paint that isn't high heat ?