i had asked the superlube company about the grey buildup in the suberlubed non-anodized bare aluminum threads (e.g. in Quarks or Klarus P1A) suspecting that the superlube oil would dissolve the unprotected aluminum and the answer i got was:
and yesterday the maker of Nano-Oil (a substance which i assume works a little better on unanodized aluminum threads) who is wary of making any kind of promises regarding the performance on unanodized aluminum threads commented:
From google cache one can see that 1 or 2 years ago he was selling Nano-Oil on cpfmp but then he stopped the dealer's subscription on cpfmp. In any case, as far as i can tell the original problem of
unanodized soft bare aluminum threads (male rubbing against female)
is still unsolved. But it's good to know that superlube does not dissolve the material. As stated earlier, superlube does kill the friction in the bare aluminum threads. Feels really good and smooth. (Not so good on Titanium threads, though). No wonder that nobody wants to promise anything or promote the oil further on CPF: we flashaholics are highly criticial (some with asperger's) and much of our Chin*se threads are just made of cheap aluminum quality. I'll continue to assert and promise that there is no lube on earth (< 20$) which solves the original problem to kreisler's satisfaction.
With typical lube (superlube, nanooil, silicone oil, etc.) we will always end up with grey crap in our unanodized aluminum threads. Simple as that. It's maybe comparable to the example of stainless steel kitchen countertops: when you try to clean/scrub the kitchen counter with a dishcloth, the dishcloth will end up grey from the stainless steel abrasion.