  We present a long-term light curve of the precataclysmic variable (CV) V1082
Sgr obtained by the K2-mission over the course of 81 days. We analyze the
entire complex light curve as well as explore several sections in detail with a
sliding periodogram. The long dataset allows the first detection of the orbital
period in the light curve, as well as the confirmation of cyclical variability
on a longer timescale of about a month. A portion of the light curve in deep
minimum reveals a clean, near-sinusoidal variability attributed to the rotation
of the spotted surface of the donor star. We model that portion of the light
curve assuming that the donor star grossly under-fills its Roche lobe, has cool
spots similar to a chromospherically active, slightly evolved early K-star, and
might be irradiated by the X-ray beam from the magnetically accreting white
dwarf. The fast variability of the object in the active phases resembles the
light curves of magnetic CVs (polars).
