To spike hair up with gel, work a small amount of gel into hair that is slightly damp and style it as desired using the fingers. Damp hair will dry into the desired style to create a longer lasting hairdo.
When creating a spiky hairstyle, it is very important to use a quality styling product. Only a dime-sized amount of gel is needed if an appropriate styling aid is used. Spike It by Beyond the Zone is a popular gel for creating spiky hairdos. Garnier Fructis has created a product called Power Gel Spike Explosion; it promises to hold hair in the desired style for 24 hours.