[NYCSTRIPES]

Quantity of paint really depends upon a couple of factors.
a) preparation of the paint surface
b) how well the sub surrface is primed, how well the color coat covers the primer coat.
c) skill of the painter
d) how many coats you can get the work surface coated in/type of oaint.

You are on the right track, I used to pain for a living and tinker around with painting track plastics. You can call if you like and I would be glad to explain the process for you.
Regardless what you do, since its a track bike, get some extra painy in case you need to do some touch up work later on.
Clear coat can also be included in the color coat to save you a step. I can also explain the advantages/disadvantages of each to you.
Drop me a PM with a contact method.
Ken