For quite a few years I have been using a product called Tear Mender.I patch blue jeans, tents,my winch cover, nylon saddle bags, just about anything fabric or leather. I have never had a patch come off of blue jeans after they have been washed many times. Dries in 15 minutes. Sort of a latex glue
I buy mine at Ace Hardware, 6 oz is about $6 -$7

https://tearmender.com/

Last edited by saddlesore; 12/31/16.
If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles