I've attached a couple of links to coloured packing tape suppiers (the stuff is hard to find locally)
have also included a link for a supplier of fiberglass spars.

http://www.fast-pack.com/colored_tape.html
http://www.uline.com/Browse_Listing_...lor+Coded+Tape

http://www.goodwindskites.com/merch/...olidfiberglass