not really sure about powder, but covergirl lash exact is THE BEST EVER!!! it never clumps --i use it-- and is super fast to apply. you can also get a volumizing variety, and it doesnt clump either.
I have found that the volumizer from loreal is good and stay away from water proof oh and always remove your old make up before reapplying it helps oh and remember you get what you pay for.