I found a very small cut (1/4") on one of my front axle cv boots that was allowing grease to ooze out. Quick fix for temporary is to clean the boot rubber very well and scuff it up lightly w sand paper. Then I took some 527 glue, which is flexible, and coated the area liberally. So far after about 10 miles of riding it is still holding well. The 527 glue is available at walmart. I have fixed MANY kids toys with this glue and the clear 5 min epoxy!!

Should work for a little while at least till I can replace the boot.