Tire balancing for track tires is kind of pointless, I don't do it and I don't know anyone that does it (I mean actually know, not internet-know). The tires pick up rubber, which throws off balance, and the tires rotate on the rim, as illustrated in Gearhead's post above. Save the money on balancing.
I don't tape my weights on street tires, and haven't had any issues. They're loud as hell now and have some rubber boogers etc. so I don't really know that I'm seeing any benefit from the weights anyway.