I wish it was... it is much thicker than that and doesn't stick to itself which means I have to tie it off instead of just wrapping it, and it is way too thick for a bud to push through it the way they can with parafilm.
Sounds like traditional grafting/budding tape. That's what we have used for many years. The end is simply taken under the last turn and pulled tight to secure it. For most grafts buds are not expected to push through. When used for budding the tape is wrapped to leave a space for the bud to grow. This type of grafting tape is usually sliced off after the graft is healed. The strength and elasticity comes in handy when making cleft grafts as the tape can push the sides together to make better contact. Parafilm can't do that as far as I'm aware.
Parafilm is a relatively recent product. I am old school and have not really learned how to use it properly for grafting yet.
The juniper is doing well. How much thicker? Some of mine with tight trunk bends have now merged into a solid mass as the trunks grew thicker than the curves and curves merged into a solid lump of tunk.
Introducing some thin shari now can help. Widening the shari each year or 2 gives great texture to the dead wood as new layers are added each year.
I also note the short straight section close to the ground. My early attempts also had this as it is hard to bend the trunk so close to the soil. More recently I wire the juniper whips when bare root so wire an bends can start right from root level.
If the straight section becomes a problem simply raise the soil level. Shimpaku juniper produces roots real easy and will root from the trunk if it is covered with soil so no need to go to the bother of layering.
