Unfortunately our covers are totally different. We use a friction additive in the unleashed and a projection additive in the uncaged. We rely on chemical friction to get our ball motion, other companies use mechanical friction to get ball motion. Chemical friction means the molecular structure of the cover has the desired friction from the chemical bond created by the polymers and the additives. Sanding it will not alter the chemical friction thus you would simply create a fresh surface of the same friction we designed the cover to have.
Hope this helps
Phil