Since 1997 Sears has been undergoing rather constant revision, and the process is expected to continue for awhile.
The notes here were correct as of Dec 2003.

Sears Point is a dangerous track. There is very little runoff room around much of the track. Due to mountains, bridge supports and close walls there are several areas where a substantial misjudgment will end up with the car striking hardvertical obstacles at high speeds (the exits of 2, 3A, 4, 8A and 10 all fall into this category, let alone the exit of 11 which is, itself, a hard wall with no tire stack).

Since repaving in 2003 the surface no longer exhibits the substantial unpredictability of traction in the wet that was typical before that. However, driving Sears under wet conditions continues to be an exercise that needs extreme caution.