I've tried numerous as well, albeit not all mentioned here.
I've been on the Obenaufs program the past couple years.
I've done four different sets of G Body seats and a few others. The thing that strikes me is how quickly the seats SOAK it in. Sometimes, it soaks in so quickly (especially the initial application) that I immediately reapply before I move on to the next seat.
Definitely best to do it when the seat is warm / interior is hot. A few times I've let the engine idle in the driveway (after a drive of course) for a few mins with the heat on full. Between that and sitting in the sun, even the Heat Miser would break a sweat.
A few times, I've applied with the seats out of the car, especially prior to long term storage.
