How do I know if my bumper is painted correctly?

My bumper was repainted by the body shop.

Now I want to put those full stick-on bumper guard on it. I was told if the body shop did not repaint it correctly the paint will peel off if I ever remove the bumper guard.

So how would I know if the bumper is painted correctly like a factory painted bumper?

The body shop is pretty reputable and was recommended by my insurance.
 
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