I don't understand why so many people want to try to bud/graft with substitutions for real grafting tape.  I like the 4 mil but have used 8 mil in a pinch but didn't like it as well.  I do a few hundred buds a year.  Last time I got grafting tape I sent out a few rolls to forum members.  I just got in 12 300 foot rolls of tape from Womacks nursery, way more than I need.  You can do more than 300 t-buds with one roll.  
http://www.womacknursery.com/item30.htm  I will mail a roll to whoever wants one for what I paid plus postage.  I paid $2.50 delivered to my house and postage is about $1.50 or $2.00.  Send me a private message if you want a roll