So same idea but as a temporary thing to improve technique.Funny thing is, when i started using [vaseline] i found it really helped, so i used more and more of it. Eventually one time i ended up with big lumps of it on the strings which made a terrible twanging sound. So i seriously cut down on my vaseline habit at that point.
What i found, though, was that the lubrication making my fingers slip off one string onto the next in picado changed my technique a little bit, made me feel like i needed to tense my hand/s and fingers less, and i tried to develop that further without the vaseline.
I think this might be an important insight. I had the same experience of trying it and needing quite a bit at the beginning, then eventually hardly using any at all - all while I removed a lot of excess tension and increased speed and ease of execution.
It didn't occur to me that the lubrication itself must have corrected and improved my technique. But this makes sense.
I just played the most humid gig of my life today and i tried the Vaseline trick since my fingertips get really really sticky . Just a dab on my right and left hand fingers completely cured that ! They were gliding across the strings ! I think it may really help out in any situation ... highly recommended !A little Vaseline will help the RH "glide" through the strings more naturally. Using a VERY thin film of it usually does the trick. As far as the LH: I've noticed that a TINY bit of Vaseline or Hemp / Almond oil can soften up callouses a bit, making things such as slurs / trills more liquid.