Unlike oil based paint, which takes time to dry therefore allowing the artist to manipulate over a period of hours or days, acrylic paint dries fast. Painting with acrylic has to be immediate. The advantage with acrylics is that you can get transparant effects by simply watering down the pigment and the colors have a high intensity. Mixing acylics is difficult because of its drying time, which can be extended with water. Like guache, watercolor or tempera, acrylic will layer well but will not have visible brushstrokes like oil.