Undercarriage restoration color choice

I was able to buy the same Wurth Gray referenced above and the color and texture looks spot on to me. It can be left 'as is' for the underside of the car, or painted body color on the valances beneath the bumpers. I think we have a winner:)

View attachment 49881
So is it a standard practice on higher end car restorations to protect the underside with wurth and single stage color match? Or just the wurth grey is enough?
 
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