Pete is correct. ...damn, did we discuss this before or am I having a MAJOR deja-vous? Anyhow you can buy Helicopter tape by the roll from racing suppliers, check your local phonebook or the web. I bought mine from Coleman Racing a few years ago.
The stuff reminds me more of thin plastic than heavy duct tape. But it is sticky on one side like tape. You can use a heat gun or blow dryer to form it to compound curves. The roll I have is clear. I bought it to protect the paintjob on my car when using it on the track, as it allegedly comes off when you re-apply heat leaving little or no residue, and without removing the paint. All I ever ended up using it for though was door sill protection on my Miata.