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Is starting with a layer of helicopter tape the way to go?
That's a way, if you want the π tape to be a permanent fixture. For protecting the π¨ from being pulled off with the tape, you can use low tack tape as a barrier. Over that, you add π for mechanical protection, then a fibre reinforced tape for the actual attachment. PVC electrical tape or silicone rubber self-amalgamating is too elastic to hold a full bottle given how much leverage it has over the relatively small attachment lugs.
Also, @Lolo is rightπ
If I wanted to tape a bottle cage to my bike what would be the tape to use? I've used electrical tape instead of a cable guide before, but can't ever take that off again as the paint would come off with it. Will self-amalgamating tape be the same? Is starting with a layer of helicopter tape the way to go?