This is a jar of an extremely volatile smelling black Goo. Is equipped for the brush in the And when you take the brush out gobs of this stuff will drip off the brush if you're not very careful. I applied it to a couple of wires that I had soldered together. It took at least a day to become dry and not tacky. The product seem to have run off of the few areas and I question the insulation that was left behind. All in all unless you have A reason for using a liquid insulator I think I'd stick with the old plastic caps or the black tape.