Correct me if I'm wrong, but gold plating is an ion bonding of two metals, no clear coating required. But overtime, the gold plating can crack from corrosion if the surface is not taken care of.
I see a lot of car rims' chrome plating crack
His gold plating comes out of spray bottles and is a repeated application process of chemicals and bonded minerals ...
it is closer to paint .. then it is to real metal electrolysis of gold karat or smithing that one would see in chrome bumpers of the 1950s.
His 'gold plating' is a few microns thick ... and auto parts cheap.
This not Jewelry craft.