1. Apply the foam tape to the outer edge of the frame (as shown in diagram above). Tape is required on the top and left-hand side only. 
  2. Start the tape from the top right hand corner and carefully peel back a small section of the protective liner to expose the adhesive.
  3. Press the tape firmly into place at the top of the frame while slowly removing the backing as you go. Avoid stretching the tape. Keep it straight and even.
  4. At the top-left corner, cut a small triangular notch out of the foam tape so it can fold neatly and form a clean L-shape without bunching. 
  5. Press the tape firmly down the left hand side of the frame. When you reach the bottom corner cut off cleanly.
  6. Repeat the same process on the matching side of the other frame.