Not really. It’s only 1 layer of a very thin material. The benefit is that it’s already covered in a moisture-retentive layer and it shaves anywhere from a few seconds to a few minutes (depending on your skill level) off of each graft from start to finish. You’re just moving those minutes to the setup phase, plus you shave off time fumbling for your tape. I think I got the idea from @marknmt. You could also do a graft then bind then wax dip. Or you could do nothing other than what holds the grafts together, but the moisture barrier helps. Here’s a good discussion of the various techniques and why:
Glad to see you’re practicing already. It helps a lot! I’m only marginally qualified to give advice on this subject, but it sounds like you’re off to a good start. Make sure to look up the various annual grafting threads, as well as questions from beginning grafters. Lot’s of good advice and helpful nuggets hidden in there. It can take a bit of work to assemble it into a system that works, but the nice thing is there’s more than one way to do it. Here’s another good system: