I've used it many times too, finding the break in the element might take a bit of doing, before now i've had to use a pinpoint type circuit tester to find the minutest of scratches, worth masking up before dabbing the paint as it goes on in thicker blobs than you might expect and every time you walk past the car that excess blob will look like a glowing beacon of fire to your eyes, ask me how i know this..:-)