Step 9: Finish Grind
If you want to sand your edges smooth, use a fresh coarse grit abrasive in the sander of your choice.
Use a light touch, some types of foam will roll and rip if you use too much pressure.
And that's it! Enjoy the cushiness of your immortal shoes!
When your new sole wears down past the tread and you want good traction again you can impress new tread in it with the edge of an iron.
Don't slip and fall.