belt gizmo: nixie wire insulation question

So I’m looking at heat shrink tubing to cover the wires of the nixies I got for my belt gizmo build (using Nick-a-tron’s resin kit). I’m not an electronics guy, so I was hoping someone may be able to shed some light, here:

Is 3/64 heat shrink going to be tight enough for nixie and resistor wires??