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When buying artist's paints, make sure you buy the 'opaque' rather than the 'translucent' version (unless you want to use it diluted as a wash).I find the artists' paints last better, cover well, and have more even pigment than craft paints.The hobby paints are usually fine as well, but often dry up quicker than the artists' colours.
I've always liked Windsor & Newton artists acrylics, but my stock has slowly dwindled over the years. Blues and whites in particular tend to be strong and easy to use.
Another thing worth mentioning is Golden, Liquitex, and probably others also make fluid versions of their paints. I use both heavy body and fluid titanium whites for different applications.
Another thing worth mentioning is Golden, Liquitex, and probably others also make fluid versions of their paints.