For the base coat, I normally use Tamiya or Mr. Aqueous, because they cover well and adhere to the surface. After that, I use almost whatever paint gets the job done and is the colour I have in mind. I have given up spraying Vallejo, Mig etc. over bare plastic because they just don't like that, and — in addition to ditching lacquers as I mentioned above — I don't buy any Hataka acrylics anymore because they really don't want to cover worth a damn.