1. and 2. I can find Star Tron all over the place. It's another of the products that makes huge claims in regards to fuel treatment. It's not horribly expensive. It is available locally if you have a Northern Tools or some Walmarts as well as several other stores. Star Tron has been recommended to me in the past. I don't use it. I just let em grow. Keep in mind you don't need to carry it with you either. If you go on a ride and burn a tank of gas, then it didn't affect the tank. If you refuel your bike and come home, add some at that time.
One thing I've heard a few times but haven't seen mentioned as often, if you ride daily or very regularly that the fuel doesn't have time to attract water. The idea is that you are keeping the fuel fresh so it doesn't need to be treated as it won't affect the tank. The swelling is from the alcohol attracting water to it and then the plastic absorbing the water. If the bike is going to sit for 2 weeks or longer between runs, then you might want to treat it.
3. Replacing the cap with one with a breather. Well................The tank and cap already have a breather in them. So...... I don't get it. Are they ignorant? From my above comment about how the alcohol attracts the water and the water causes the plastic to swell, I'd think the more vents/breathers you add- the more water can contaminate. I would not suggest plugging all the vent holes as it is necessary to vent the tank.
4. Yes but noooo... It takes a couple of weeks for the tank to dry enough to shrink. However, blemishes don't always go away. Some will shrink but still be visible to some extent. The best remedy I've heard of along these lines is to completely drain the tank, leave none at all in any little corner or it will turn to varnish and gum up all of the injectors, and then leave the fill cap open during your non riding season. I live in Austin, you live in Houston, unless you are a sissy we don't have a "non riding season". Sucks for us, eh? Yeah it's nice. That's why I've given up caring about the tank and pay more attention to just enjoying the machine.
5. Don't know and good luck. I won't be paying $10 for a gallon of fuel. One thing to keep in mind is that Texas is switching to "winter blend" right now and your local stations might not have ethanol or it may be reduced. Keep in mind the sticker reads "up to" 10%. That's weak language. Strong language would be "must have, shall have, will have" etc. So maybe we luck out that we ride in the winter months and "might" have less than 10% ethanol during those months. If so it's a win win win. We get to keep riding, less ethanol means more potent fuel=harder acceleration, cooler air means better oxygen introduction and even more acceleration. Yay us.
6. I had the brand new tank on my Paul Smart coated with Caswell epoxy. It was supposed to be awesome. It is no better than the previous tank. In fact......my previous tank had just grown a bit. I had no idea it was even a problem until my local dealer offered to replace it. I said sure why not. I ponied up for the Caswell myself. They roughed up the new tank, cleaned it, and coated it. What I see now is positive and negative blemishes. I preferred the old swollen tank to my new tank with small lumps in it. Rumor is there is a shop in California that does a new coating, 3M or something, that is designed for this type of thing, however they can't do Monster tanks for some reason. I haven't checked the authenticity on this.
While I didn't have the best results with the Caswell system, I would still recommend it if it is the only option. Remember kids, some protection is better than nothing at all. So still keep it as an option.
Good luck and let's ride sometime.
06 Paul Smart Sport Classic NFS ever.
08 S4RS Tricolore #081 NFS ever.
01 M600, aka, The Pink Monster
97 900SS CR
72 Norton Commando 750
03 KX60 with S4R rear shock,Honda CB350F, Hodaka Ace90, 3x Yam-YGS1, Yam-CS3 200, Vespa small frame, Gilera 106, Puch Sabre, Puch 50 Boy Racer, Ducati 250 bevel, Benelli 250, Benelli 360, Honda CB350T, and many more.