what are the must ask questions you ask when talking to your customers

My wife’s car didn’t come out as good as I wanted it to and so i’m going to redo it. It’s just a bit streaky in spots. Is there any difference between the process I should take doing this vs a regular damaged light? Any tips or suggestion? I used the headlight magic coating. Thanks!

First time attempting this and hopefully soon be able to start up a little side business..

First attempt went well. I’m looking forward to where this takes me.