Just bought son a used car...What is the best way to restore shine when the finish looks pretty dull?

 

If it's that dull, nothing short of refinishing it will bring it back. This is due to the fact that the clearcoat has likely worn off exposing the base color.

Best bet is to visit a body supply shop and show them the vehicle. They can recommend the right product, if any can cure the existing paint job.

Why did you purchase the vehicle if the finish was so dull? May have been poorly maintained .