There is a supplier called Black Note that claims their NET juices don't destroy pre-made coils. They are not into making anything cheap, it is more of a quality oriented product, probably not for beginners, in my understanding. Again I am not associated in any way with them. I haven't tried it and I probably won't because I am a cheap guy (I rebuild coils, so I never buy premade coils, anyway), but some NETs destroy coils faster than others, this is a fact.
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