Flow Along Surface errors

Flow error

I keep coming up with a drawing that has separated lines thru the jpeg when I flow the pic on an airfoil shaped object? Any ideas?

I suppose that it’s caused by the low density of the rendering mesh used to represent the NURBS surfaces in the viewport. You may try to see if this will fix it: Rhino options > Mesh > Smooth and slower.
Or, you may assign a custom mesh setting to the selected object(s) via the Properties panel.
But I think that texture mapping is the best way to do it.