From my own experience, there are lots of different types of reflective tape. Meaning that when you do find tape get one that is thin and flexible for wrapping around curved surfaces like a motorcycle helmet or bike frame.

The super-thick stuff is made for flat surfaces like truck bumpers and signs and. (I think it's called diamond-grade avoid this). I bought some of 3M diamond-grade and couldn't get it to stick as well as the SOLAS or the 3M reflexite.

This is the kind of stuff that works:
http://www.aerostich.com/product.php?productid=16513

or this (colors!)
http://cgi.ebay.com/ebaymotors/ws/eB...m=330050001953

Good luck with your project.