What Should You Do When Your Latex Paint Becomes Too Thin? But, if you notice that the paint is coming out very quickly, you have to assume that your paint has become too thin. It indicates that your paint’s viscosity is perfect when you pour it into the cup, and pours out smoothly and uniformly. This cup serves as a funnel to measure the viscosity of the paint and should be a part of several high-quality spray systems. A viscosity cup can help you measure more precisely.
