We have previously shown that the viscosity of 2NapFF solutions at concentrations of 10 mg/mL or lower show shear thinning behaviour when shear rate is increased. Liquid crystal systems, due to their preferred orientation, can show more complex viscosity behaviour. Combinations of shear thinning, shear thickening and plateaus can be observed within a single sample. To prove that these are true features and not simply sample artefacts, we check for any time dependency and instability within these 2NapFF samples, using the 40 mg/mL concentration sample as an exemplar. We begin by set the rheometer to hold a constant shear rate values of 1, 5, 10, 50, 100, 500 and 1000 s -1 for 10 minutes before moving to the next (Figure ). We can see over the 10 minute period of constant shear at each rate there is no considerable change in viscosity. This suggests the shear thickening/plateaus seen in the 40 mg/mL samples are not simply due to a time dependence or instability. Additionally, we examined the effects of pre-shearing on our 2NapFF solutions at concentrations of 10, 40 and 100 mg/mL. As previously stated, wormlike micelles constantly break and reform when shear is applied. To again check for instability and sample memory and history, we use the rheometer to pre-shear our samples. Here, we use the same sample to perform two consecutive viscosity sweeps at each investigated concentration. From our data in Figure , we see that our samples are stable after pre-shearing and does not alter the viscosity for concentrations of 10 mg/mL and 40 mg/mL 2NapFF. For solutions at a concentration of 100 mg/mL 2NapFF, there is a small decrease in viscosity caused by pre-shearing.