To repair 8-track tapes you need Foampads, Felt ( self adhesive furniture felt ) and aluminum splicing foil. You can make them yourself from stuff from the DIY store or buy it online.

You can order supplies here or if i'm sold out on   Kate's Track Shack.

If you want your tapes to be repaired klick  here

8-track repair tutorials on Youtube

https://www.youtube.com/watch?v=FYCrkiwhVPc

https://www.youtube.com/watch?v=_YpkIqc-0Go