Hi all,
Just to reiterate the points mate in this old post.
Over the holidays I completed my full open-water dive course.

Before I left for the trip I did a full head bond, and over the course of the week had very little problems.

Obviously the hair floats around quite a bit, however everyone is too busy concentrating on other things that to notice your hair line and generally you are only underwater for 42 minutes max.

For the close-up action, with the instructor less than a metre away in a swimming pool, they also seemed not to notice.

That said....I wouldn't trust tape alone.

So... if anyone out there is considering your SCUBA Open Water and are hesitant... do the full head bond and go for it..

Alternatively.... the other 100% solution is to buy a diving cap before you leave then you'll have no problems

Cheers