The CV (constant velocity) joint boot on the drive axles? I wouldn't attempt to patch those... just replace them. CV boots are cheap. Be sure to grease the CV joints before you put the new boot on.
If the CV boot is damaged and dirt/water gets into the CV joint (dirt will get into the CV joint grease), the joint will eventuall wear/fail (and you'll hear it wearing). CV joints are much more expensive than the boot. This is one of those repairs which you should catch/perform early.
cheers,