Does the racing line or whole track gain grip between sessions?

I know there are no marbles and no change during a session, but does the grip disparity on and off the racing line change when the next session is loaded?

 

Grip differences are only between the Sessions themself
Practice --> Qualification
Not sure about different grip on Race Session

But for sure the Grip does not change during a Session itself.
So no Dynamic Race Track/Line

 

We know the grip levels increase with each session. I think the OP is asking whether the track as a whole gains grip or just the racing line. Is it a bigger drop off when running off the line when in a race that in a practice? Anecdotally I'd say I don't feel a difference.

 

Yep, that's exactly what I meant. I haven't noticed a difference on and off the line, but I'm not sure if it's just because I'm a bad driver.