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In the mean time, try reading this article: http://fromthewarp.blogspot.com/2012/01/7-tips-for-painting-vehicles-without.html?m=1]]> http://www.dakkadakka.com/dakkaforum/posts/preList/584767/6632250.page http://www.dakkadakka.com/dakkaforum/posts/preList/584767/6632250.page GMT
If you're paint more than couple please just save up for an airbrush. Even a cheap one just to do base coats. You'll hate yourself less.
The Master series is great to start with (basically clones of brand brushes decent reviews)
http://www.tcpglobal.com/airbrushdepot/abdbrand.aspx

Or even look into colored primers and spray paints.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/584767/6632275.page http://www.dakkadakka.com/dakkaforum/posts/preList/584767/6632275.page GMT
GW has recently posted a vid of brush painting the Imperial Knight and he achieves a smooth paint-job. He is painting over black but the base color is designed to have quite a bit of pigment.
http://www.youtube.com/watch?v=9pB-0089Cc4&list=UUwdh3MTrFq3sXlB4ct8B-Fg&feature=share&index=1

I watched another vid recently that displays how to apply a wash like Agrax Earthshade without leaving those blotchy marks that are a typical complaint for vehicles that you may also find helpful.
http://youtu.be/Eo97yCgUlko?t=15m8s]]> http://www.dakkadakka.com/dakkaforum/posts/preList/584767/6632807.page http://www.dakkadakka.com/dakkaforum/posts/preList/584767/6632807.page GMT