If you are gonna mix paint types- enamels/acrylics, you should give at least a day between colors to allow them to dry and cure before adding the next color. They occasionally have some sort of negative interaction of paint types. If using the same type of paint- acrylic/acrylic, enamel/enamel, but diferent brands, usually if the paint is dry to the touch, it is safe to apply the next color. Of course since some paints dry at different rates this will vary your time frame.
F is for FIRE, That burns down the whole town!
U is for URANIUM... BOMBS!
N is for NO SURVIVORS...
- Plankton
LSM