Shrink cover rubber for soldering is not very expensive but if ya can get something just as good and more flexible for free then weeeeellll lets try that I say.
The material we are going to be using is nothing more than old plastic shopping bags or black bin liners for a tidy black finish - with the use of a heat gun this easy to use item is very handy and always available to just about anyone.
For use around the home - well I use it for many things but most of all when sending items I have sold on Ebay or anything else to be posted that will benefit from a waterproof, tight cover for fixing shipping labels etc, just take your item and a sheet of plastic big enough to cover, gently heat and your all sorted.
Once you start using this material I think you will find loads of uses.
Step 1: A Demonstration
Step 2: Find
Step 3: Lets Wrap
Make the binding as tight as possible, simply to give a better finish - I have done the first covering in white to show things up a bit better but will finish with a covering of black in a moment.
Ok run the heat gun gently over the wrapping - takes only seconds - if need be, hold the end of the wrapping with pliers (aha see told ya ) to give a nice finish where the material ends.
Step 4: There Ya Go
Lets finish off with some black though just to show you how really tidy it can look.
Step 5: Over the Top
If you find a ragged end just re heat the plastic till it is quite a bit hotter and smooth things down with your fingers by rolling the wire between them or! wait till everything is cold and trim up with a blade.
Step 6: Just to Conclude
Grab hold of the cables and gather them up into one run - take your plastic material ( get a whole bin bag and spit it into a long length ) - wrap around the multiple cables in an overlapping spiral and then use the gun to seal the lot .
Try this out - play around with the different applications and I think you will be really surprised how well this performs.
Be well, have fun.