1. Pull off the PU film from the package and cut a suitable length with scissors according to the size of wound dressing ,2-3 cm more in length and width   than wound dressing.       
2. Peel off the release paper along the edge of PU film.
3. Put the PU film on the dressing and skin smoothly and press gently. Do not pull the film in order to avoid skin  trauma due to tension.
4. press gently to smooth it while Peeling off the backing film from S cutting.
5. Press gently the film and Make sure it fixing tightly.