i think the spray painters can cause big cost blow outs if your not careful, be on the front foot with them, rub it back yourself, pull it apart yourself, don't pay till its done, and start with good panels in the first instance and give them a time limit of 4-6 weeks max otherwise they will use and abuse you.

if you don't like the progress, turn up with a car trailer and take it away, don't persist with loser panelbeaters. ....

i used this method to paint my van in avatar for $2400 10 + years ago.