Dual wall shrink tubing
The video mentions dual wall shrink tubing. Dual wall shrink tube has an outer plastic wall and an inner wall of glue (often polyolefin). When applying heat, the plastic shrinks and the glue melts to form a good seal. When done correctly, the seal will not only be insulated but also waterproof and dustproof.
I find 3 to 1 shrink tubing more flexible than 2 to 1 shrink tubing. When heat is applied it can shrink to 1/3 of its original size.
You can buy dual wall tubing in long strips or cut to various lengths and thicknesses. Common colours are red, black or clear. Clear being the most versatile and what I used it here.
Where to buy
For users in Australia Rhino Tools has good tubing (but not always in stock) and US users look at Wirefy on Amazon of their website. At Wirefy you are spoiled with the huge selection.
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