I have been using this for a week or so now and it really works! So basically when you apply your mascara, on your top lashes use your favorite volumising mascara, then put a coat of a waterproof mascara on top of it, while it is still wet. Then use the water proof to do your bottom lashes if you want to as you don't need as much volume but the mascara comes off easier. Hope fully that makes sense!
It makes your mascara stay on for longer, be water proof but still have the thickness you get from a volumising mascara.
Hope i helped!