On Jan 27, 7:36 am, Chris wrote:
I my vinyl windows there is a black caulk-like strip around the outside of
the window. On some of the windows this caulk-like strip has cracked and
pealed away.

I would like to re-caulk if possible. Does anyone know what this stuff is
called?

Dont' know what the old stuff is called but you will be using caulk
for the repair. Buy a high quality silicone caulk for that purpose.