I have experience with crush ‘n run as a driveway material. As long as the base is solid, applying crush ‘n run as a topping material should work fine.
I would suggest wearing surgical masks if you work it yourself. It’s quite dusty as it’s being applied. Hose it down well after you’re through.
Wishing you well.
Has anyone had experience with just a concrete floor? My husband used to do concrete for a giant PreCast company and he just bought a portable concrete mixer which is rapidly becoming a new toy. . .