I understand what your saying, but the places they are drilling to spray are places your not going to reach without cutting your vehicle apart. I have been doing various DIY rust preventative measures myself every year for the last 10 years or so, and for the little extra that I spent on the KROWN application this year I'm sold. I watched them apply most of it to my truck and is evident they did a superior job coverage wise over what the average guy can do. For me to do the same quality job they did in less than 2 hours time would take me the better part of a weeks worth of evenings. They were all over it like a swarm of ants. I like to do my own work whenever possible but this is one instance I feel is better left to the pro's...just my observationsI think the in frame coating is in theory the same approach, but I am not drilling holes in my truck if I can avoid it. I will pull panels where I can.
Dave
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