There are three methods through which you can easily secure your slippery headbands. The first solution is by using hairspray and bobby pins. In it, you need to first use the hair spray on the part you are going to put the band. Then, wear the band and use two bobby pins, each side creating an X shape. The second method is by using puffy paint or hot glue. You can apply one of these on the reverse side of the band, and they will get locked with your hair preventing slippery situations. The third method is glueing Velcro to the reverse side of the band. Remember the width of the Velcro should be half to the width of the band. You can choose any method as all three are equally good.