Using a couple of pairs of old goalkeeper gloves I thought I’d do a comparison between a pair of gloves that have been treated with Vaseline and a pair that have not.

As I don’t know whether Vaseline will damage the latex, I wouldn’t use or recommend the use of Vaseline on new gloves.
There are other products on the market such as Glove Glu, which may be better suited for the job. I have never used Glove Glu so can’t comment of it’s use.