fyi, the smaller rolls are a similar but different material, not the same thickness or adhesion level. Vycor will work just fine in most cases, but it's not as durable as it's not intended to be walked on. If it's likely that the crack may get bigger (if it's right in front of your seat especially) then I would make a point of using real bitch.
If you want some, pay for shipping & I'll shoot you some. I grab leftovers off the jobs my guys are working on, so I've usually got quite a bit of it.
Discover Denver, stay there!