. The Model 250 single action, external mix, bottom feed spray gun is great for any job requiring a simple, yet effective spray. The Model 250 is basic enough for children, (ages 8 and up) to use with minimal adult supervision, yet effective enough for adult use. This gun is perfect for jobs requiring large overall coverage with medium to heavy viscosity materials. Modeling, school projects, home improvement projects, workshop jobs, ceramic underglazing, fogging, texturing and stenciling can all be handled by the Model 250. The spray pattern can be adjusted from 3/4" to 2" simply by turning the paint tip. The Model 250 uses 3/4 oz. or 2 oz. capacity jars.