How should I curl my hair extentions with out the curls falling out?

I am a hair dresser and if you use Marcel wax and spritz, those curls aren't going anywhere. Some times after I shampoo and dry, the curls even come back. Also, if someone else does it, they seem to stay longer for some reason. If you re using a plug-in iron or an oven, make sure your curler is hot enough or your curls will fall right out.

How should I curl my hair extentions with out the curls falling out?

as long as they are 100% human hair, you can use thermal setting spray before you use a curling iron.....this will protect the hair from the heat and keep the curls longer. it acts like a hair spray without flaking like hairspray can.