Shrink tubing is a small plastic tube that contracts when exposed to heat. Steam or an indirect lighter flame are both sufficient heat sources.

You can use it for countless purposes in predator fishing. Most commonly it serves as knot protection and as a cover for crimp sleeves.

Cut a piece of shrink tubing with the right diameter to the length you need, slide it over the section you want to cover, and hold it over steam where possible. The tubing shrinks down and sits firmly in place.

Yes, that works, but you need to be extremely careful not to damage the material underneath.

As a rule, pay attention to both the inner diameter before shrinking and after. You can also choose a colour that matches your rigs as closely as possible to keep them well camouflaged.