It is scary but I think it depends on the tard in control of the bladder. Guy I had do it was very gentle and I noticed nothing regarding the sealing. * He gently jacked the door, not the window, then reached in with essentially a pro-grade coat-hanger.Those air bladders they use to widen window frame gaps are scary. I watched a guy get into a Dodge Durango with one and I can’t imagine the door sealed the same afterward, but it sure was quick getting in.