When you use a heat protectant, the hair should be lightly misted but not damp. A gentle spray will be enough.
For tight curls, hold the iron vertically, and move down your hair slowly (not so slow that you burn your hair, of course). Depending on the length of hair, spend about 20 to 30 seconds slowly moving down the strand. For loose curls, hold the iron horizontally, and move down your hair more quickly. For curls that turn away from your face, twist the iron up, toward the top of your head. For curls that turn toward your face, twist the iron down, toward the ground.
Proceed with caution. Aluminum foil cools relatively quickly, but it’s still easy to burn your hands or your scalp during this process. Err on the side of ironing for too little time at first, to avoid burning your hair.