Clean soiled fabric by vacuuming the cushions, arms and other areas of the sectional sofa. Apply an appropriate cleaning product to the stain and use a lint-free cloth to gently blot it. Repeat until the stain is removed.
Spray the edges of a tear in the upholstery with a fray prevention spray. Pinch the edges together and carefully tuck them inside the tear.
Thread a curved upholstery needle with a strong nylon or upholstery grade thread. Choose a thread color that closely matches the upholstery. Tie a knot in the loose end of the thread.
Pinch the two edges of the fabric together once again. Slide the needle through the fabric, keeping the knot on the underside. Sew the tear closed using small, even stitches. Tie a knot in the end of the thread. Use the point of a small pair of scissors to poke the knot under the stitches. Trim off any excess thread.
Vacuum any loose debris from the surface of the leather. Clean and condition the sectional with a leather cleaning product, applying it to the leather and working it into the upholstery with a circular, buffing motion. Clean the area around a tear with rubbing alcohol, using the same buffing motion.
Cut the edges of the tear with a craft knife to create straight edges. Slip the fabric included with the leather repair kit under the leather upholstery. Use tweezers to help you slip it under the fabric without tearing it further.
Gently lift up the edges of the tear with tweezers. Squeeze a small amount of leather repair adhesive from the kit onto the fabric you applied in the previous step. Press the leather down onto the adhesive.
Set a heat gun or blow dryer on low. Stand about 10 inches from the tear and gently wave the hot air back and forth over the repair. The added heat helps set the adhesive. Allow it to dry completely.
Squeeze a small amount of leather dye gently onto a makeup application sponge. Blot the paint onto the patched area. Continue to apply paint until you have blended the patched area with the rest of the sectional. Allow the dye to dry completely before using the sofa.