Cracks in Leather
The only way to un-crack leather is to replace it. One approach that leather repair specialists use is to clean the leather and then re-color it. The result is that the leather will have a uniform appearance. The cracks will still be there but will be less apparent.
You can also have a leather repair professional replace the cracked areas and match the new leather to the original color. This works best when you are working with a panel of leather, for example on a car seat or the surface of a furniture cushion.
Dog and Cat Scratches
If you own a dog or cat, do not allow them on your leather furniture – PERIOD!
For dogs, most damage occurs while climbing on and jumping off. If you are a cat owner, leather fillers or tanner’s resin will cure the symptoms but not the problem.
You might consider buying your cat a scratching post and put it near the area where the cat is scratching before using the filler.
Spray water on the scratch and cover it with a small square of 1000 grit wet sand paper from the hardware store. Sand very lightly until the surface is smooth and you cannot feel the tear from the scratch anymore. You may end up needing to re-color the furniture if the scratch damage is extensive. That would be a job for a pro.
Leather Repair Kits
If your leather has a tiny tear and it’s not highly visible, (and if the color is black) any leather repair kit should be sufficient if you follow directions.
However, there are a couple of things to be aware of in case you run into problems. The repair material may not bond well with the leather. This happens if the leather is old or if the heating element supplied with the kit (if it’s included) is not hot enough.