The tpfer on the Hermes forum who gives leather advice is docride. There is a lengthy thread in the Reference Section of how to care for Hermes pieces.
I have only used Meltonian to touch up small rubs on the corners. If the purse has faded then it is time for a professional spa. Believe me it is money well spent. I don't know what long term effect of putting shoe polish on the entire purse but I will hazard a guess that it could very well dry it out over the long haul. There are different tanning processes for leathers. I wouldn't want to cause the leather to lose its moisture which may then lead to cracking.
I have sent a vintage purse to Chanel for spa because they know the leather, their product best. Sometimes penny wise, pound foolish. I will DIY condition periodically and be sure I store purses propely but I would never apply shoe polish on the entire purse.
I've read many many of the maintenance threads on tpf for various types of bags, and I've read most of docride's posts as well. The Meltonian cream polish and conditioner isn't the same as regular "shoe polish" that you'd buy at your local drug store. It's specifically formulated for retouching and conditioning of leather. The problem with many professional redye jobs is that they come back stiff and hard and totally change the texture of a Chanel lambskin bag. Hermes bags use much different leather than Chanel. I have also seen posts from people who worked with professionals who dye Chanels and they said they use sprays to color the bags.
I always advocate that a person contemplating using a product read up on it, then test it on a small inconspicuous spot, same as anyone would recommend. Using products that are formulated for the type of leather you are working with is always advised. That said, after doing much research on all of the threads for many types of bags, I have assembled a collection of products, of which Meltonian is one. I have used the white cream on a vintage Chanel mini and the results are better than that done by the Chanel spa person. So I think it really is up to each person to do their reading, find out as much as they can, and decide from there.
