Not sure about Scotchgaurd although I would probably try it. Best bet if there is any REAL leather involved would be to ask a REAL shoe store owner (the kind who can repair shoes) or a custom upholstery shop. They should be happy to provide expert advice and the correct products. Shiny leather is a LOT different than suede. If I recall properly there is a 'Water Repellent' spray treatment specifically made for suede, like Scotchgaurd...