Punching Bag Repair with Duct Tape
Cut away any frayed edges, loose strings or small obstructions that could get in the way of the tape sticking to the bag.
Measure the length of the tear and cut off a slip of duct tape that is slightly longer than the tear.
Place one end of the tape at the beginning of the tear. Slowly drag your finger down the tape, sticking it securely to the bag.
Gently rub a small piece of sandpaper against the tape if it has a glossy finish. Be careful not to scuff the bag.
Dip the paint brush in the can of paint and cover the tape with it. While a single coat should be sufficient, you might want to cover it a second time so that it blends in better.