I just finished my first tactical squad's Rhino last night. I brushed every coat there as well. Six coats of white. Followed by liberal use of gold over black for the trim and ornamentation and silver drybrushed over black for the machinery. Red trim on the Storm Bolter.
You play Space Wolves, right?
Yeah got a few nice Tanks and Dreadnoughts
I tend to paint them using a brush to. Airbrush is nice for adding shading but I need to get used to using one.