enicalyth - please accept my apologies and ignore me if you were just being flippant, but the correction for specific gravity is more useful when considering contaminents such as snow or slush, which both have SGs below 1.0. (Dry snow ~ 0.35, slush from 0.5-0.8 I think)
I do agree with you in essence though - a fluid with a lower SG is less able to sustain the required (shear?) force due to lower density.
But if you find yourself landing a jet aircraft on a runway flooded with fuel, I suggest you're shortly going problems other than hydroplaning to worry about! WOOF!