I see it different, and it's been noted by some drivers and team personnel. The new pavement provides TOO MUCH grip that grates the tires down. Goodyear then has to make a harder compound to prevent tire failures. It's these hard compounds that simply dust the track with 'rubber' rather than stick to the surface. When a caution comes out, the hot tires lift this false layer of 'rubbered in' material, and the track is back to where it was when the race started. So we never see a second groove come in, and it's single file, aero push racing all day.
The slower and lighter late models at Martinsville were able to run on softer Hoosier tires. A true second groove came in, and guys were racing side by side all the way around the track long after the green flag waved. You just don't see that second groove ever come in when the cup cars are racing on those hard tires, and Martinsville isn't a repaved track. It's a slower track, but the weight of the cars dictate a thicker sidewall, which causes over heating and tire failures. That's why the compound is so hard and never truly rubbers into the track. to have these problems at a short track just shows what an impossible position Goodyear is in. The only way to make these heavy cars work is to bring a larger diameter tire, and perhaps even wider than they are.
The biggest problem isn't repaves, which could be made slightly better by using more aggregate (slippery stones) in the mix. These problem can't be fixed until nascar goes to a lighter and slower car. This will allow Goodyear to bring a softer tire that actually rubbers into the track, rather than laying on top.
