Well the vinyl showed up today and it turns out its got a felt backing. I did heat it a bit and that provided quite a bit of stretch so I decided to give it a go on a saddle that was pretty much toast anyway... Complete and udder failure. The foam on the saddle started to separate from the base and the vinyl started to separate from the felt around the nose. This giant piece of vinyl might wind up as a shop apron. Back to the drawing boards for me.