There are a few threads on treating bags where I've said if it's not absolutely necessary, I wouldn't do it. Not that the results won't be a happy one, but the bag is already protected when it comes from the retailer and if that's why it's being done, there's no reason to. Other than an old & parched black city, I just treated my ink work because I use it ALOT. It came shiny and stiff but softed on it's own without anything. Since then, it's been on the ground, spilled things in and on it, smells, etc (don't worry I won't sell it anytime soon...lol) so I thought it was necessary to work on it and get the lining cleaned but used the minimum number of products on it. I'm not sure what a pre-treatment is. I got great results, but I made sure the bag was moisturized well. After using a cleaner/moisturizer (I haven't tried LMB, but have my own natural lanolin product) it does get very matte (almost stiffer), then I moisturized it with the cream. It softened up but was still matte, but you could feel the suppleness come back. The shine restore brought back the luster it had lost. Now it's better than it was before.