If the zolotone is still bonted good then clean it to make sure its oil free and any paint should bond well with it. If your down to the aluminum then a epoxy primer and paint. www.westmarine.com
sells paints that will bond to the aluminum no problem. Its for hulls on aluminum boats. Had to use some to seal an area where we had some galvanic corrosion.
If you go that route be sure its well ventilated. That stuff does some serious outgassing as it cures.
On ours we are still looking at new Zolotone but for me to apply it I would need several hundred dollars in the correct pressure pot paint gun. I am going to check with the Body shop I know ande see if he has the equipment and what he would charge to do the paint application. Between experiance and the equipment even if he charged a couple hundred more then the equipment costs he would get better finish product. Now I would bring him a empty coach already taped off so it would not require working around cabinetry. He would just need to walk in, paint then I would tow it home to cure.