Lash Blast doesn't seem to be clumping on me like my usual mascara's do. Ok - the 1st time I apply them they don't clump but since I'm bad about washing off my makeup and I reapply on top of the old mascara for a few days - it can get pretty clumpy around my peepers. So far the mascara has passed even that test. I bought the waterproof version and it hasn't been smudging or sweating off. It is a little difficult to remove but if you take it off in a hot shower the steam seems to work wonders.
Another plus - you can use this mascara with the Spinlash brush if you want. It has been working for me!! I use it both ways depending on the rush I am in. Mascara, bronzer and lip balm are the 3 things I won't leave the house without applying. So in short - I love this mascara and I buy a lot of mascara. I'm really bad about buying expensive mascara from Sephora. I just can't stop myself. In comparison to pricier brands...Lash Blast works just as good!