Exteriors get most of the attention in this industry, but interiors take a harder beating for less credit. Sun bakes the dash and seats, kids and pets do what kids and pets do, and a spilled coffee or a muddy...

Cars cost more than ever, but a lot of what’s inside them — the plastics, the seats, the paint finish — is built to a tighter budget than it used to be. That’s the honest reason ceramic coating has become...