I would add this to your boat emergency kit or supplies for electrical work on the boat or home. This tape is a great and better replacement for shrink tube. You can find this stocked along with the other cheap and standard electrical tape at Lowes or Home Depot. The great thing about this tape is it adheres to itself and even moreso over time. Its great for taping ends of electrical connections (e.g. battery cables), sealing something that needs to be waterproof, etc.