I sprayed my case about 6 years ago not one scratch on it.
Moved houses twice.
Most importantly you need to prep correctly.
Step 1: a good sanding and clean with tack cloth
Step 2, 3 & 4: light layers of metal primer wet sanding in between
Step 5, 6 & 7: light layers of metal top coat wet sanding in between
I used automotive paint.
Didn't use a lacquer didn't want a glossy finish.
Prep is the most important step.