Diazo emulsions have a shelf life of 30-45 days after mixing and must be stored in a light-protected room or cabinet after coating and drying. Dual cure emulsions have a longer shelf life and are slightly easier to wash and develop than photopolymer emulsions. SBQ emulsions have the longest shelf life of one year and are the most expensive type of emulsion. All types of emulsions are applied using a scoop coater or automatic screen coater and require different thicknesses of capillary film depending on the type of printing.