I tried a small piece of cling Vinyl in the shooter lane. Did not like the fit and slightly tactile feel, which lead me to think it might affect the ball when struck by the plunger. I removed the Vinyl and replaced with a similarly sized piece of adhesive backed Mylar. Mylar surface feels more slippery and matches what I have done on other machines with no noticeable effect.
I placed the Mylar patch just along the right half of the the shooter lane, up and over the ridge, opposite the ball trough exit. My GoT had developed a small chip in this same area where it continuously gets smacked by the ball. The chip has not gotten any larger, and the Mylar patch has not deteriorated at all.
Like shown above, I used the Cling Vinyl to protect the cabinet decals around the flipper buttons and start button.