Someday I may have flames, or pinup girls, or other decorations on my tank, but for now, I'm just shooting for something decent looking. However, every little flaw on the base primer coat will be magnified under the paint, and this tank had many, many little chips in the previous coat of paint. The answer, spot putty, wet sand, and prime.
You can see from the pictures, where every orange splotch was a chip, and it now an orange splotch of spot putty, that there were a lot of chips and imperfections on this tank. Find a chip or divot, spot putty, wet sand with 700 grit emery paper, and prime. Repeat.
By June 19th, I'd put a last coat of primer on the tank, though every time I look at it in different light, I see another line, or small chip, and I have to fight the urge to spot putty, wet sand, and prime. Sometimes a little wet sanding is enough.
It hasn't all been tedious spot puttying, wet sanding, and priming. I've also been sanding, priming and painting the battery box, tool box, brake light bracket and air filter box (since I'm using pod filters, I may not even use the air filter box), which you can see in the background (as well as mint terrorizing my garden). I've also been able to do a little bit of mechanical work, there's a new chain on the bike, new ignition switch and mirrors. Gosh, when will I be able to ride this?