I'd be tempted to give one of these products a try:
http://www.gyeonquartz.com/product-guide/q-leathercoat
http://www.gtechniq.com/products/auto/perfect/exterior/paint/l1-leather-guard
http://www.carpro.uk.com/cquartz-leather-vinyl-coat-30ml/
The Nanolex product is very similar as well.
All seem to get good reviews.
Regards Bob
http://www.gyeonquartz.com/product-guide/q-leathercoat
http://www.gtechniq.com/products/auto/perfect/exterior/paint/l1-leather-guard
http://www.carpro.uk.com/cquartz-leather-vinyl-coat-30ml/
The Nanolex product is very similar as well.
All seem to get good reviews.
Regards Bob