The material being used may need to be thinned (diluted) with the proper solvent as specified by the material manufacturer. After thinning the material, use the viscosity cup included to test the viscosity of the material. Follow the instruction below for proper testing the viscosity. Stir the spraying material thoroughly before measuring viscosity Dip the viscosity cup completely into the spraying material and make sure the cup is filled with the material. Hold the cup with material over the container, measure the amount of time in seconds it takes for the stream of the material flowing out to "break" or stop being a constant stream out of the bottom of the cup. This is the Runout Time For proper runout time of specific material, refer the thinning table below: Thinning Table Material Reference Runout Time Oil enamel 25-40 seconds Oil based primer 30-45 seconds Latex No thinning required Oil stain No thinning required Clear sealer No thinning required Polyurethane No thinning required Varnish 20-50 seconds