Like any painting it is all down to the preparation. The cover comes as standard with a celulose finish and laquer on top, you have to remove all of it or it will react to the 2-pack and peel off.
When you have got it back to the bare metal you need to put on a few good coats of high build primer letting it dry between coats. No need to bake it, it will dry fine as long as you have mixed it right. Once you have got the primer on well put a light spray of a contrasting paint on top of the primer, very thin, just a dusting. Sand the surface with very fine wet wet and dry paper with a spot of washing up liquid in the water. You are not trying to take it back to the metal, just to remove the contrasting paint and leave the primer so as to flatten the surface. Dry it off well.
Next spray as many thin coats of top-coat as it needs to achive a high shine flat surface without having to cut it later. Again if you mix the paint right there is no need to bake it.