Interesting comment, many years ago the founder of Leathereqi, myself and Judy Bass of LTT had a very similar discussion.
Be cognizant that a water emulsion has a larger molecular size than water and may not be able to permeate the micro pores of the urethane covering


a) Water-resistant: able to resist the penetration of water to some degree but not entirely.
b) Water-repellent: not easily penetrated by water, especially as a result of being treated for such a purpose with a surface coating.
c) Waterproof: impervious to water

I think (b) is the most appropriate for modern automobile upholstery

 

Any concerns about using these products on perforated leather? How about white stitching?
I have always wondered how much leather is actually there on the 'standard' leather package. Feels much more like vinyl than soft leather.

Thanks!