i tried this on my slightly drying mascara, and it works a treat!
i use argan oil on my face, along with my moisturiser, its very very good!
anyway, i thought id try adding a little bit of the oil to the mascara wand brush.
i swiggled it about in the barrel, curled my eyelashes as usual, and then applied the mascara.
excellent results!! the mascara went on a dream, making my lashes appear thicker and much much longer.
try it! it seems to help condition them, too.