Acrylic paint can dry quickly, so do not squeeze too much paint onto your palette at once. Gradually add a few additional drops of acetone if the paint is too thick.
Focus on creating long strokes when painting a large surface to avoid creating streaks. If you are working on upholstery, plan to paint only one side at a time.
Be sure to clean your brushes each time you select a new paint color to work with. Keep a small cup of water next to your workstation. Dip the paintbrush in the water before placing it into another color.