Putting graphics on almost any plastic tank is a waste of money unless you like the lumpy bubble effect. I'm really not trying to rain on your parade, but if you must have something on your tank, you will be much happier with a tank cover. I've put graphics on my XR's tank from 3 different manufacturers (Factory Effex, N Style, and Ceet) always hoping that the next one wiil hold up and not look like crap, yet all of them were bubbling within a week. The money I spent on them certainly would have served me better had it been spent it on fresh tires, a new chain, or any number of functional things for example. But the bottom line is, it's your bike and your choice.
I would happily consider a tank cover if you could point me to someone that sells them. I had one on my Yamaha IT250 and really liked it. I could only find one seller, on eBay, and I believe it was in another country. I didn't really like the design anyway.
I have never had any issues installing or keeping graphics on my bike. Even the One Industries
that I just took off was on the bike since I purchased it, and that was four year ago.
I would also consider going without tank graphics if the tank didn't have a couple of gouges in it. I figured it would be easier to cover it up with some good graphics...........