Paint damaged from overheating engine

chubs

Hi guys new here to the forums

Since this forum has the best detailing section that I have come across I thought I would ask here. My dad has a Kia Karnival and the engine had overheated. Now when it over heated it has damaged the paint causing it to look dull and white ish (paint is black). Tonight I tried polish and some cut n polish on it which made it a little bit better but not a great deal.
Has anybody had this issue before/know how to fix the paint without a respray?
Basic theory I have come to is that due to the paint being cooked basically that a respray would be required.

Cheers in advance
Chubs