Hi EJ, I had some hairline cracks in my leather as well, unfortunately there is nothing you can do to make the leather "stronger". You can clean and preserve what you have but if you can put your finger through it now no amount of conditioning will make it so you can't put your finger through it after. I did the whole cleaning and conditioning thing on the car I'm working on now and the good leather really cleaned up well but the cracked leather has to be replaced, thus my seats are now an my guy's getting repaired. I'm/he's doing his best to only replace the damaged leather but we'll see what happens.