Well, it seems the provided context is about as useful as a chocolate teapot for actually fixing a sofa. One source is the general legal boilerplate of YouTube, and the other is a blog post that promises a step-by-step guide but only delivers a website's navigation menu. So, let's toss that aside and get down to business with some real advice.
So, your magnificent leather sofa has sustained an injury. A battle scar from a rogue pet, a skirmish with a set of keys, or perhaps a puncture wound from a particularly sharp piece of party cheese. Before you drape a throw blanket over it in shame for the rest of its days, know that a fix is possible.
First, you'll want to play surgeon and clean the wound. A bit of leather cleaner on a soft cloth will do. You can't perform miracles on a dirty surface. For a small tear or cut, a leather repair kit is your new best friend. These kits typically come with a sub-patch, which sounds very official. You'll trim any frayed edges from the tear, then gently tuck this fabric patch underneath the leather with tweezers. Apply the provided adhesive to glue the patch to the underside of the leather, creating a stable base.
Next comes the artistic part. You'll apply a leather filler compound over the tear in thin layers, much like spackling a wall. Let each layer dry before adding the next, until the area is level. Once it's fully cured, you can lightly sand it to be perfectly smooth. The final act is to mix the colorant to match your sofa's hue—this is where you find out if you missed your calling as a master painter. Dab the color on, blend it, and once dry, apply a leather sealant. Voila! The evidence of the cheese incident is gone, and your sofa is back to its former glory. Just remember to test any products on a hidden spot first, unless you're going for a surprise two-tone effect.
