the wind shear would fluidize the composition so that it would flow off the wings thereby obviating excess weight or interference with the air foil surfaces a thickened propylene glycol composition having the following formulation was prepared as per the procedure of example 2 ______________________________________ wt ______________________________________propylene glycol 47 7 boehmite alumina dispersion 20 al sub 2 o sub 3 11 9 magnesium nitrate mg no sub 3 sub 2 6h sub 2 o 0 7 aluminum nitrate al no sub 3 sub 3 9h sub 2 o 0 7 water 38 2 sodium hydroxide 50 0 8______________________________________ ______________________________________ rpm viscosity cp ______________________________________ 0 3 3 333 0 6 2 000 6 0 1 200 12 0 550______________________________________ a thickened propylene glycol composition was prepared by mixing the following components in the order and amount shown at high shear for 5 6 minutes ______________________________________ wt ______________________________________boehmite alumina dispersion 5 9 al sub 2 o sub 3 44 7 propylene glycol 54 6 ammonium hydroxide 1 5 0 7______________________________________ the ph of the composition was 7 3 brookfield viscosity measurements using a 4 spindle are given below ______________________________________ rpm viscosity cp ______________________________________ 10 0 4 100 20 0 2 300 60 0 970 100 0 660______________________________________ ______________________________________ wt ______________________________________water 35 0 nitric acid 0 3 normal 5 4 boehmite alumina powder 71 4 al sub 2 o sub 3 3 5 propylene glycol 53 8 sodium chloride 2 2______________________________________ the first three listed components were mixed together under high shear ross mixer model 100 l for 10 minutes the final two components were added in the order shown and the composition was mixed another 5 minutes to completion the.