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I don't think it does anything really, no.
However we did get some tape which had a serrated edge and I expect if you fold out those serrations to act as a ring of spikes then it might work.
Can you train the guinea pigs to eat slugs?
My technique is to send slugs and snails on a flying lesson into the railway line behind the house.
Does copper tape work for keeping slugs away? I'd like to stop them joining the family guinea pigs and raiding their food. The Internet seems to have opinions both ways. Perhaps works better with two layers wired up to 9V? Or is there something better?