The humans still left on Caprica {their home planet} after it was nuked and taken over by the Cylons, all had perfectly gelled hair. They lived in the forest and scrounged for food and clean drinking water while fighting the Cylons, yet they were able to maintain their hair gel supplies.

During battles with the Cylons, stuff would be blowing up all around them on the various ships, but their hair never got messed up, even if they suffered massive 3rd degree burns on their entire bodies. You couldn't always recognise the face, but you knew who's hair style it was.

On New Caprica, they had virtually no supplies {a piece of rat jerky costs an entire day's wage} and the conditions were extremely hash, but they had plenty of hair gel.

After they left New Caprica, the President and the Admiral were talking and they said that all supplies were either completely gone or were going to run out in 2 days. 3 weeks later and their hair is still perfectly gelled, but the only food they have is algae soup.

Every time a helmet comes off {think hat hair}, their hair is still perfectly gelled.

I'm not really complaining, as there are some very hot guys on the show, but really, let's have at least a tiny bit of realism.