If you find a mascara that really works well for you, save the brush. That's the part that's doing all the work to get the style you want on your lashes, not the actual mascara. All mascaras are the same, just divided by waterproof or regular, so you can dip your favourite wand into any mascara and you will still love your look. I learned this from my makeup artist sister. I use my expensive Too Faced brand wand on cheap drugstore mascaras, and I still love my lashes while I save $20 a pop!
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If you use water-based mascara (as opposed to water-proof), add a couple of drops of water to it when it gets near the end, or if it gets too dry. Editor's Note: There appears to be a lot of concern about this tip due to bacteria. As with all advice, contact a health professional to be sure.