Cars Q&A

I had minor starched on my newly car bumper and i got it repainted from local shop he first cleaned my bumper then sanded it with wet sandpaper then he repainted that area so my question is i dont remember whether he applied primer or not before applying paint. If he didnt applied primer on that area will it cause damage to my paint will my paint come off or will it last long and what precaution should i take or what can i do to protect my paint and when can i shampoo my car after repaint and can i apply primer over paint now