In my humble opinion, the best method is to use the Loctite rear window defogger repair kit. It's available at most auto part stores and is reasonably priced, approx. $10. I applied it with the blunt end of a sewing needle. Just a tiny dab across each of the L1 bridges. Dries quickly, up and running in ten minutes. Semi-pemanent because it will not rub off but can be removed with something like finger nail polish remover or naptha.
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