Europe got onto the 2-stage paint before the US did, I've been told around the late 70s.
Originally their clear was like a varnish and would blister.
Then it was an acrylic enamel.
The test for single vs 2-stage was rubbing some fine sandpaper on it:
White transfer = clear, same color as the paint = single stage.
Problem with that is nobody's gonna let you do that to their car.
The fogginess could be the beginning of clear coat failure, before it starts to blister & peel.
Plan on it needing paint - or, you could do a wrap if the surface is perfectly smooth.
The more metallic a color has, the less receptive it is to cutting & buffing as far as bringing back color & depth.
Silver is about as metallic as colors get.