So how do the shops access the dog leg? that is the area where you open the rear doors, in front of the rear tires. I agree I don't like drilling holes, but this area either has to be accessed from a rear rocker panel plug (factory) or a long wand in from the tail light opening. Just know this area I'm trying to rust proof is a usual area for rust on 4runners as they get older. My climate is very humid, next to the ocean and see 6 months of winter every year. Want to keep my 4Runner for many years. To put it into perspective the F250 at work had its box runners rot off in 5 years, and needed complete replacing.

I have used rust check and krown for years, they have a database created to identify the best points to apply their product, as some factory access holes may not be in the best location due to double walled metal, etc. Always had holes drilled, never rusted around these holes as lots of their product would be sprayed around the hole. However I always hated having holes drilled in my shinny new vehicles. I am buying the fluid film professional spray gun kit and doing it myself for this vehicle, I've watched rustproofing be done on my vehicles for many years and would rather do it myself as I know I can do a cleaner job, and not many shops concentrate on he inside of your frame rails (a weak spot for Toyota) and my taco's new frame needs the best protection it can get...