Hello! I am not sure if this is the right forum to post this in, but I am trying to come up with an equation to predict the viscosity of a waterborne paint after it has been reduced 10% with DI water. The following viscosities were measured at 20*C on a Ford #4 cup, units are in seconds. The viscosity of DI water at 20*C is 9.9 seconds on the Ford #4 cup. These data points were compiled while I was trying to thicken a sample. Unreduced / Reduced 10% 24.5 / 17.4 25.7 / 18.0 29.5 / 19.8 31.9 / 20.9 36.5 / 23.0 39.6 / 24.0 Can anyone help with an equation that would estimate the viscosity when it is reduced 10% with DI water? Right now I'm trying to make a chart in Excel and figure something out with the slope. Not working. Any help that can be offered will be very greatly appreciated!