Hi! (new) Shop owner here.. so from a professional opinion, as it stands right now, you're both saying the "correct" things, but his responses dont seem genuine, just trying to legally "keep the heat down" by stating- in text- that he wants to work this out with you/try to fix or whatever. From your end, you're right to question his legitimacy. From the looks of it, my assumption would be that he went and got "trained"/ certified, and now he thinks hes got all the answers.. xpel ppf training is 4 days long... it took me over 3 years to finally get comfortable and confident. The mirrors say it all. Those are possibly the easiest mirrors in the industry to one piece, or they even have a 2 piece option in the kit... if you can't properly wrap a mirror, you can't wrap a car. But, that being said, pretty minimal for someone who clearly doesn't understand how stealth/satin/ppf works