Because the rear quarters are triple paneled it's very hard to impossible to get behind. If your ding is on or near the crease, using the glue method may be close to impossible.
I've had a ding replaced right near the door handle on the belt line crease and the PDG had to drill a small hole in the door jam. He painted the edges of the hole and plugged it with a rubber grommet. You can't tell if from the factory, so if you trust your PDG and know his work, don't go all "I never drive my car in the rain" on him......
Yep that's what I heard, triple paneled. Not quite that exact description but I was told it's tight in there. I tried driving the car the other day in the rain and it really isn't fun, at all....lol