A protection system kit is provided for at least one vehicular window panel mounted in a window opening of a vehicle. The kit comprises a film unit supply assembly including a release liner and a multi-layer, self-adhesive film unit. The film unit includes a first film layer and a first adhesive layer releasably securing the first film layer to the release liner. The film unit further includes a second film layer secured to the first film layer on the release liner by a second adhesive layer. The second film layer is selectively removable from the first film layer by peeling the second film layer away from the first film layer. The first adhesive layer is adapted to secure the first film layer to a vehicular window panel in an associated window opening of a vehicle. The first and second film layers are pre-configured to fit the window opening.