Respectfully tell your Dad that the newer paints are water based, and there’s a clearcoat over the paint that will help it survive. Clearcoat is not a apply-and-be-done solution, though, and if you want to take care of it long term…use a good wax.
That’s my opinion on this particular subject. On top of that, a good waxing always makes them look lots better, too. 
Chase