I know there are eyebrow serums on the market and I've used revitabrow with good results but can I use a lash one on my brows? I use revitalash on lashes and someone has given me an unused Rapidlash (it has an applicator like a mascara wand rather than a tiny fine brush) anyway, do you think I could use it on my brows to condition them? Obviously I wouldn't use a brow product on lashes but surely the other way round would be ok.....