Cadillac conditioner

Not at all! I didn't start using cadillac until after a patina developed on this bag, but I have used it on weeks old vachetta with no darkening. It's just so easy to use ... no risk of uneven application causing marks, no sticky or greasy feel, no stress!
One more thing - I actually got black ink all over the handles some time after I first applied the Cadillac. I think the ink got on my hand from some grocery item (expiration date ink that was running on a wet plastic wrapping). After I noticed it, I used Cadillac to clean it off and you can't even tell!