When I did my cushions for a 7' table, I knew I would have some excess because the cushion set was long enough for a 9' table. So, I tried a few ways of cutting on the excess rubber, including:
- Dremel tool cutting wheel
- Hacksaw
- Jigsaw
- Breadknife
- Power miter saw
None of these methods worked as well as a sharp utility knife blade dipped in soapy water. Change the blade after 2-3 cuts. You can use a sander to remove uneven edges.
If your cushions are long enough, practice a few cuts on the ends.