Whatever I do they still flatten after 10-15 minutes... O. o
The most time they've stayed 'curly' was when I curled one and put hairspray on it, then pinned it and left it for a while - did this every time I curled a piece of hair... it stayed in a semi curly condition for maybe an hour an hour 1/5... o. O
Make sure you use a really good curling wand or iron... when I use my Hot Tools curling iron my curls stay put relatively well throughout the day and I don't even use hairspray. However when I use my flat iron to give me curls then it only stays in a while. Just like a good straightener is needed for straight hair, a quality curling iron is needed for curly hair.
Lots of hair spray :) or you could put curlers in for a while and then take them out and curl the bits that aren't curled very well just to give it that extra bounce :):) then put an even amount of hairspray all around your hair :):) then they should stay like that for hours :):):)