[Optimus Neeson]

I've used Model Masters Acrylic and Model Masters Enamel. I didn't like the enamel at all, because it would rub off when lightly scratch, or even when lightly rubbed with regular printer paper.
The acrylic paint works good enough for me so far, except on flexible plastic, like 3.75 inch GI Joe webgear.
Before using Model Masters Acrylic, I always stir the contents of the bottle thoroughly for about 15 seconds. Sometimes I even water it down with between 1 to 4 drops of water. I never primer or sand any surfaces, but I do wash them with soap and water between 2 to 4 times to ensure that all grease has been removed. And I never clear-coat my work either, because I don't like putting solvents on top of finished paint work; nor do I trust that the surfaces will retain the texture I want; and I don't want the clear-coat to form a seal on articulated areas that, when moved, will chip the paint off.
And just so you get more than a lot of talk out of me, here's a raptor I painted with Model Masters Acrylics:
Every single surface was painted, except the teeth and the inside of the mouth.