Answer: Vaseline is not recommended on the rim of the can (called the chime) as it can contaminate a water-based product and may cause surface defects. Instead, GF recommends always carefully cleaning the rim of the can before putting the lid on tightly with a paper towel, then again with a damp paper towel.
![open can of stain](/sites/default/files/styles/max_325x325/public/images/blog/2017-04/dsc_0134.jpg?itok=2ZApIbqw)