Every tube of Mascara becomes clumpsy overtime.
It dries out and then starts to form unattractive lumps.
To help prevent this, don't pump your Mascara trying to get more on your wand; you are basically pumping air into the tube causing it to dry out even faster.
Although Mascara should be replaced every 3-4 months, but there's an easy fix for that!
All you need do is 'add a drop or 2 of Visine or any brand of eye drop into the tube, and then rub the wand around inside.'
The Visine softens the Mascara liquid, making it apply as if it were a brand new tube.