TLDR : Liese hair make (a GT sis recommended it here sa thread..she bought it in SG ata)and you're probably curling wrong.
^^^ mga sis with curling issues, have you tried Liese curl make? It's not available locally sa PH though. If you want good brands of hairspray, kindly visit your nearest mid to high end salon

I prefer Japanese salons mainly because I prefer Japanese products. Liese is japanese btw.
I've come to terms that my hair is as hard headed as I am. LOL (hindi naman nagbear ang apple tree ng orange diba?) my hair needs a regimen before it stays curled.
e.g. preferably day old hair..preferably no conditioner and was shampooed previously (sayang lang na hindi fresh yung feeling.
I just blowdry nalang after a bath)
Hairspray before I start.
When I curl, I curl at the highest heat setting for 15-20 seconds. lesser will not keep the curl at ALL for longer. and I can only grab siguro mga 1 CM diameter of hair at a time. And the most important part would probably be na when I remove the curler, the curl should be curled like an "O" and pinned to my head..or pinned in place.
And lastly, hairspray everything again once everything is curled.. uncurl only at the last 10 mins (10 mins to look and fix your hair if there's something wrong sa curls)
Invest in a good hair curler.. I have babyliss clip on.. hindi yung mga cheapipay generic nasa watsons.
In total, hair curling takes me.. at least 1 hour!!! LOL hay nako. Now, if di naman stubborn yung hair mo, it doesnt have to be so tedious and you can deviate naman. Problem is, if nagmamadali ako sa pagcurl ng hair ko, nagmamadali din siya sa magstraight niya! hehe
Now, some may argue that the above process is too tedious and some are proud to say na they dont take that long. geez,not everyone has easy-to-style hair. Good for you though. Maarte din ako in the sense na I do NOT want hard curls. ugh! Gusto ko kase malambot

If hard curls lang, madaling hard hairspray lang yun.
My hair is complicated to work with compared to most women..its not yucky, it just doesnt stay styled.
Hairstylists cannot keep my baby hair in place..unless they use hard gel or spray.. And matakot sila bigyan ako ng bangs and give me a disclosure muna. Blowdrying frizzes the hell out of my hair when used at a high heat setting; so I calmly request them to use cold or not hot, which equates to a longer time fixing my hair. =.=
anhaba pero hopefully it helps someone