It could be true, I haven't used nonleaded since I got my soldering station, but even using a 40w crappy iron I had issues with the non leaded not adhering properly.
I just gave up on it and bought the leaded stuff and have been using that without issue, only when I run into crappy wires will it not adhere, and that's usually because pretinned/coated wire sucks up solder much more efficiently I find. Uncoated wire seems to need a lot of flux, whereas the coated stuff needs none at all aside from the prefluxed solder.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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