One thing my wife always complained about when riding on the back of my GL1500 was that the seat (a Corbin, and apparently they're known for this) is slippery, and she is constantly sliding around and having to push herself back up.
She was trying to come up with a solution, so she thought; "what about that stuff you use to line drawers with? Wouldn't it help make the seat not so slippery?"
I figured she might be right, and decided to give it a try. I found a roll at Lowes for $10 - six feet of it, so I've got lots left over to line my toolbox drawers. I wasn't sure if the charcoal or the grey color matched my seat better, so I got one roll of each.
I cut a piece roughly the size of the rear seat, put it in place, then trimmed it with kitchen scissors to match the basic outline.
The end result: It works - amazingly well! We went on a two-hour test ride, and my wife reports that it made the ride far more comfortable, and that she doesn't slide around at all anymore.
So if you are looking for a simple way to fix a slippery motorcycle seat, this stuff works like magic!