DEFINITELY the mold release compound. 500 miles, then you can pound on them.
Slight drift:
I love S-03s, I've put about 30000 miles on 2 sets of them. But there are a few compromises you make to get that PHENOMENAL wet and dry grip:
1) They flat-spot easily. Just sitting in the garage overnight, even in the middle of summer, and they are rough for the first mile or so. In April and October, it's about 5 miles til they spin evenly. The solution is to run them with a tad more air than you think you want.
2) They tramline (follow road grooves). This is worse at lower speeds. I've actually had them catch a groove as I was coming to a stoplight and yank the wheel HARD.
3) They feel every single little road imperfection; it's like I'm hard-wired to every pebble and crack in the road. The solution is to run them with a little LESS air than you think you want (yeah, counter to solution #1).
I run them at 29 psi in the middle of summer, and 31 psi in the spring & fall.
That being said, this is a tire you can drive to the track, run all day, and drive home on. I know, I've done that. I run them at 38 psi on the track.
I have the JR front & rear sways, Koni coilovers, Brembo rotors & Mintex pads, and SSR Comps as mods with those tires.
FYI, the back page of this month's Discover magazine has a dissection of a modern high performance tire, and they use an S-03 as an example.
Tom