I don't think you are being too paranoid. If you are aware of important information and you do not share that information with the customer then you're just asking for problems.
We always inform our clients of the potential risks and complications of applying/removing a wrap, as well as their responsibilities (informing us if the vehicle is freshly painted for example). It's a copy/pasted script which I adjust for each individual client. Usually we do this through email so it's in writing (or they sign a printed document) and end it with "Please read the above information thoroughly. If approved please reply with the following statement “I have read and agree to the provided quote, terms, and conditions.”
I'm not sure if this is legally binding. We are not really worried about legal issues. It's more so that the customer understands the importance of the provided information. And it covers you so they can't say "I didn't know that"
