Adhesive strips must be replaced every time the display is removed for repair or upgrade purposes.Removing the A1419 display on iMac requires cutting through the adhesive around the perimeter of the screen. After the adhesive is cut, it cannot be used to re-seal the display in place, so you'll need to apply a new set of adhesive strips Before you start placing strips, remove all of the old adhesive. Use a spudger to scrape up an edge, then peel with your fingers.Remove all of the remaining adhesive strips from the iMac's frame and display glass. A1419 LCD panel adhesive strip kit (6 pieces) replacement included