need to join a 4 core flexible cable (too short) -probably .5mm cross section . Low voltage 12v plus data. Joint needs to be water proof (ish) and robust. Used in milking parlour . Cable will be exposed but rigid and unlikely to be hosed with water.
I've tried soldering and heat shrink but joint is very flexible and guess not very strong? I have attempted to cover with a section of cable sheath but its not the correct size.
As an ex boss used to say ..........What would you do ?
George

