Wall & Ceiling Plaster
Unfortunately the art of plastering and rendering is not one that is swiftly perfected so a professional plasterer is highly recommended if you are inexperienced in this area or do not have the time to practice http://www.simplifydiy.com/walls-and-ceilings/plaster
How to Plaster or Render a Wall or Ceiling
Most professional plasterers recommend that each layer of plaster is done in two applications to achieve the best result http://www.simplifydiy.com/walls-and-ceilings/plaster/plastering