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These types of tapes have worked well in the last couple of years. One is high temp which is not as pliable. I would use the high temp wrap to replace the looms for the spark plugs while the softer has worked in several Volvo headlights. If the plastic cover crumbles it's held together well by the tape yet still flexible.
For thick 120V extension cords just use duct tape and then wrap the softer tape around it. Keeps the adhesive residue from the duct tape from picking up debris and getting other things sticky.
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