  Be stars exhibit variability for a great number of observables. Putting the
pieces together of the disk dynamics is not an easy task and requires arduous
modeling before achieving a good fit of the observational data. In order to
guide the modeling process and make it more efficient, it is very instructive
to investigate reference dynamical cases. This paper focuses on continuum
polarimetric quantities and is the second of a series that aims to demonstrate
the capacity of deriving the dynamical history and fundamental parameters of a
classical Be star through the follow-up of various observables. After a
detailed study of the different opacities at play in the formation of polarized
spectra, we investigate predictions of polarimetric observables in the
continuum for different dynamical scenarios. Our models are based on a coupling
of a hydrodynamic viscous decretion simulations in a disk and a 3-D non-LTE
radiative transfer code. Introducing the polarization color diagram (PCD), we
show that certain combinations of polarimetric observables exhibit features
that are characteristic of a mass loss history. This diagram also enables to
estimate fundamental parameters such as the inclination angle, the disk density
scale and the $\alpha$ viscous diffusion parameter. We present the PCD as a
powerful diagnosis tool to track the dynamical phases of a Be star such as disk
building-up, dissipation, periodic and episodic outbursts. Finally we confront
our models with observations of 4 Be stars that exhibited long-term
polarimetric activity.
