14 Make sure the driver stays in a comfortable driving position with hands on the steering wheel and feet on the pedals. Have him or her raise their hips up so that the foam can flow under their buttocks, then have them lean forward a bit so the foam can expand behind their back. Now they can sit comfortably in the seat again. The foam expands a lot, but don’t worry if it is restricting movement. Foam can be cut away later. Also, be aware that the chemical reaction creating the foam also creates heat. It’s going to get warm for a bit but not hot enough to burn. The driver needs to wait five to seven minutes to allow the foam to set before getting out.