The DAP 3.0 I have here is "Kwik Dry" (3 hours is a long time for regular silicone to be exposable to water), Crystal Clear, not paintable (for best results), won't shrink or crack, sub-zero application, clean-up with mineral sprits, low-VOC.
It does Not have the vinegar/acid smell. It doesn't have much of a scent at all really.
I don't think I can tell any difference between it and 'regular silicone' after it is cured.
Car test?
16 year old car windshield frame rotted around the top, water pouring in like Niagara Falls.
(I think it was broken at one time and replaced by less than careful techs)
Cleaned the rust and loose paint.
"Regular silicone" ate the metal in a few weeks(?), and I mean ate it at an astounding rate.
Had an occasion to talk to a good auto body guy. He said "No! Dig that crap out and use non-acid silicone."
(No need to dig it out. It dug itself out, which is why I asked him about it)
Repeated it with Dap 3.0, no problem for a year now? Paint under it still look OK (wasn't great when I started), last time I looked. Even started raining before I finished application. 0 to 100F, salt, acid rain, steel mills, AL and CU processing, etc.
This is an area where car metal and paint does not last long anyway (ask my late truck, which is probably being recycled into Kia's or Hyundai's as I type
).
G-
I doubt any of that narrows it down to what is in it.