Thanks for the confirmation, Muskrat. It gives me hope that with the right fuel, I won't have to try and strip out the liner.
The product in my tank is, in fact, Red Kote. After restarting the bike after it sat idle for three months over the summer (sounds crazy but here in the Southwest desert, it's too dang hot to ride in the summer!), the engine was rough and wouldn't idle. I pulled the carb, and found tacky varnish everywhere. I drained the tank, and the fuel was red, so obviously the liner was being effected by the fuel. We have 10% ethanol fuel, and it probably didn't help sitting in a really hot garage for those months, but I'm here to tell you that Red Kote is NOT impervious to ethanol. I am planning to add some ethanol-free fuel to the tank and then draining it out after a few weeks. If it's clear, put it in gear; if it's red, oh dread!