The glass is just a square order of double Dimond clear float glass, A glass shop cut height and width for me. (cost $30) laid it on the iMac and traced the corners with a very fine felt pen. Then bought a glass cutter and cut the corners just a bit larger than they should be. Used a belt sander with an extremely fine grit belt, and had had someone spay water at the contact points between the glass and the belt sander as I slowly wore it down to the felt pen marks. cleaned the glass well with non ammonia glass cleaner. Placed it back on the iMac and marked the black put areas. Used a quality frogger masking tape to cover the centre screen viewing area that was not to be painted, used a small round sticker to cover the spot for the top camera lens. Lightly just touched the areas to be painted with 240 grit sandpaper. cleaned glass again with soft no lint rag and no glass cleaner. Used ceramic black spray paint from 2 feet away, making 3 light coats, placed in a pre heated oven at 250 f, then turned it off...