be trickled in in amounts sufficient to alleviate the stiffness or to prevent gelation of the mixture with the preferred vortexing procedure water is added until the vortex stabilizes and a clear viscous solution is formed with a temperature between 35 u00b0 and 70 u00b0 c heat may be added if required the next step is to trickle in silicone the silicone usually used is methyltrimethoxy silane the minimum amount is about 1 by wight of the starter silicate solution as much as 20 has been added but cost is a factor the function of the silicone is to auto stabilize the solution by converting the solution to a silicone nucleated hydrogen sol where the silicon dioxide from the hydrogel reacts with the hydrolyzed silicone methyltrimethoxy silane ch 3 si och 3 3 is used because it is readily available relatively inexpensive and contains three hydroxyl groups upon hydrolysis which promote water compatability this silicone may be purchased from dow corning inc designated as z 6070 or union carbide other such water compatible silicones may be used but most silicones are not compatible because they do not exhibit sufficient water miscibility or impart sufficient water insolubility to the final paint the resulting solution continues to be vortexed for about one half hour until the silicone is hydrolyzed and translucent and a final quantity of water is then trickled into the solution.