Sorry for "necro"-ing the thread but: Okydoke, so over the christmas-days I have gotten around to pry away a few small paint-chips of the biggest bubble and well: There are no big signs of rust anywhere to be seen. The metal under it is grey with just a slight touch of greenish/blue but it might have just been the light. Either way, no signs of rust, dirt, corrosion or damage done by fumes of gas pushing through the metal. Although I don't think the tank as a whole has been repainted (because the bike's paint looks really well and I can't tell a difference between my Viffer and other silver Viffers), I think the previous owner might have had it repainted on certain parts or maybe the shop he took the VFR to to do the maintenance dropped a few splashes of not so paint-friendly liquid on the tank (I have the suspicion the shop-owner might not be the most careful one. And he seemed to have charged the previous owner too much for small stuff like chaning the oil, brake&clutch-fluid and the sparkplugs). Either way: I think I'll just order a "touch-up" kit with some paint and clear coat and go at it, sand down the damaged area and repaint it. Should I invest in some primer while I'm at it, too? Do they really do their job and prepare the metal/groundwork for the paint to stick to the metal? Is it recommended or even worth it to go through the hassle and put some rust-prevention-stuff like Brunox under the primer? (so the layers would be tank>anti-rust>primer>paint>clear coat).