A while back I posted about a product called the Tankslapper. This is a set of static/surface tension adhering thin vinyl panels that you put on your gas tank to prevent scratches from your zipper or knees.
I ordered off the net from their site at http://www.thetankslapper.biz/ and got my package in the mail about 10 days later.
I finally got around to putting them on just before my trip to Tofino over the last weekend.
Installation was done in conjunction with washing my bike so it was squeaky clean. I did a final rinse and stuck the panels on while the bike was wet using a car window squeegee as per instructions. This took a whole 30 seconds per side only because I was being careful. The stuff stuck down right off the bat. Being a belt and suspenders sort of guy I also hit the panels with some warm air from a hair dryer since it was a little cool out that evening.
I rode with them all weekend and a couple of rides since in both jeans and lethers. So far the panels are showing absoluteley NO sign of coming loose around the edges or slipping or developing air bubbles (aside from 2 very small ones where I can feel a little bump in the paint underneath).
I prefer this option to a tank bra for a couple of reasons. First off the tank bra is not to my stylistic likeing. Second even the best fitting bra will let dust and grit get in between and being loose will set up a sanding action. I've actually seen bras covering up exposed tank metal from the bra sanding down through the tank paint. There's no danger of this with the Tankslapper.
Not depending on glue is also an advantage. If I do catch an edge and the panel comes loose I just lift it off, rewash and rinse the bike and panel and stick it back on.
Highly recomended. Cost was about $27 Cdn at my doorstep.