RE: Using Vinyl Electrical Tape to Waterproof?
Weather resistant does not mean waterproof. The adhesive will come loose once it gets wet and it will leave a mess when you try and take it off. That's not the solution you are looking for. What do plumbers wrap copper pipe and AC lines with to minimize condensate? That is what I would look at.
Home Depot/Lowes probably has something you can use, just not electrical tape.