Curling mascaras do nothing for me. I have long straight lashes and curl them every day. I used to use the Shu Uemura lash curlers (got them for about £8 in Singapore), but Tweezerman ones are just as good. Even with lash curlers though, I have to put mascara on immediately I've curled them otherwise they start to droop. I only ever use this technique if I'm going out but it does give me a more lasting effect - put on the faintest smidge of a waterproof mascara then curl the lashes, let the waterproof mascara dry before applying several coats of your normal mascara.