Hi Ozzbike,
the 2.9 k ohm resistance sounds reasonable(!) for a thin layer. But I'm not sure what you should be expecting!
A 10 cm pencil line drawn onto paper typically has a resistance of somewhere between 10 k ohm to 100 k ohm - the variation depends on the type of pencil (or type of wax or binding agent holding the graphite lead together). At least you got less than that.

What was the resistance of the 3 coats?
Does the graphite powder conduct without the paint? Does the wet paint (with graphite) conduct?
Also, how are you measuring the connectivity?