Hi - For the knobs, I did not use paint; it was tiny white vinyl letters that I cut parts of and applied with an X-acto knife.
For the drawbars, I literally used "whatever I had around"; I had several cans of spray paint - budget stuff, nothing special. I can sometime get more exact info, but it was just typical local hardware store white (satin, not gloss) paint and strangely: a can of Primer that happened to be "sort of brown".
The trick I think it to spray carefully ... I always get the spray started to the side of the thing I'm painting, then bring the spray toward the object smoothly and go beyond the object - this seems to avoid any "too-thick" paint or too much accumulation. (I do this side-to-side several times). I give it a light coating, then let that dry, then apply a 2nd coat.