 After it is applied, the paper is sprayed with a mist of water, which causes the paper to shrink when it dries.For larger models (usually powered and radio controlled) heat-curing or heat shrink covering plastic films or heat-shrinkable synthetic fabrics are applied to the model then heated using a hand held hair dryer, laundry iron or heat gun to tighten the material and adhere to the frame.Microfilm covering is used for the very lightest models and is made by bringing a wire loop up through water to pick up a thin plastic film on the surface made from a few drops of lacquer spread out over several square feet.