I should elaborate a little further- the images are going to be applied using an inkjet printer, and the end product is something you hang on a wall for decoration, so it won't be exposed to weather like a coat, or contact and wear & tear like a sofa. It occurred to me that someone might eventually try to wipe it down with a damp sponge to 'clean it off' so I want to make certain the image is no longer water-soluble.
I hope to try a variety of colors and hide types (cow, deer, elk, etc.) so I suppose I'll encounter both veg and chrome tanned.
I want to identify something I can use as waterproofing without leaving an unpleasant residue or altering the characteristics of the material- texture, scent, hue, etc., and without damaging the image in the process of application. A quick Google search brings up hundreds of products for waterproofing leather; I need a little assistance in narrowing down the possibilities!