with resprays you get what you pay for. i had a £2500 (paint and prep only, i stripped the car) respray on my car 10 years ago and is my daily and lives outside and hasn't a blemish. ever place i go people compliment it on its deep shine and super smooth finish.
on the other hand i had a car sprayed for £200. looked really good...for about a year before it looked pants. the window rubbers were simply taped rather than windows removed so it started to peel around the windows etc
most of it is down to the prep work, rust removal etc. but get plenty of recommendations and don't just go with the cheapest.
i'm afraid this really is one of the 'you get what you pay for' moments
plastic looks cool from a distance, but rubbish up close imo. mate of mine covered his camper van in tartan material!