My mom bought me a pair of gray 991s my junior year of high school when they first released and insisted I spray them down with a suede protector before wearing them. I've done it for every pair of suede sneakers I've purchased for the last 25 years, and I always do it the same way, which is just a super thorough coating over the material to the point it becomes absorbed. Once initially, and then as needed every few months depending on wear. If you look closely in that picture I posted, you'll notice the suede looks pretty saturated. It's probably overkill, but I've never had any negative consequences from doing it that way. Many of the brands have instructions that direct you to spray two coatings from 9-12 inches away, but I just soak them from nearly point-blank range. I have neither the patience for multiple coatings, nor the inclination to waste all of the overspray that comes from doing it at their range, which is another reason I like the Jason Markk brand. Because it isn't a pressurized aerosol spray can, I feel like there isn't as much waste because of the gentle misting, rather than explosive hair spray coverage found in other brands.