Some time ago DGD was using scissors and cut a slit in her new shirt. Any mending job would be noticeable. I put batting tape on back and fused the two ends of the fabric butted together. It looked almost invisible. I forgot all about it until she had on the shirt yesterday and the tape was still holding good as new. The shirt has been washed and dried many times. In fact her mom, my DD, forgot the shirt was ever cut. I have used fusible before to mend but they eventually roll on the edges. The batting tape is laying flat and smooth.
The name of the tape I used is Heat Press Batting Together. I have a white and black roll.