Clean the area on the leather upholstery that you want to repair. Wipe up any dirt or stains with a soft rag or towel that is moistened with a warm water and mild detergent. Don't use an alcohol-based solvent, as it could damage the leather's pigmentation.
Spread a small amount of a leather repair compound over the scrape, scratch or puncture. There are many different types of leather repair compounds on the market, many of which come packaged in a leather repair kit. Make sure that you only purchase a repair kit that will work with the type and color of leather upholstery that you want to fix.
Wait for the compound to dry.
Wipe the dried compound off of the leather with a clean towel moistened with warm water and mild detergent. The leather repair kit that you purchase may come equipped with a finishing pad, which you will use to wipe off the compound.
Touch up any discoloration spots. Color touch ups will come with a leather repair kit. Some of the paint comes in liquid form, which you should apply to the spot with a small paintbrush or makeup sponge. You also can purchase leather repair color pens, which you glide onto the discolored spot as if using a marker. Wait for the paint to dry before touching it or using the leather upholstery.
Sew the piece of leather upholstery if it is light in weight, such as a wall covering or window fashion. Use a size 11 or 16 leather needle to make sure that the needle with actually cut through the leather you want to repair. Also, chose a strong thread, such as rayon. Start a few inches away from the edge when you begin to sew, then reverse forward near the edge to reinforce the edge.