I converted snow flakes to sealed bearings with the kit on treats and the hubs actually wore out. I rode them for about 6 months then noticed play the wheels, when I went to inspect the sealed bearings they just fell out of the hub. I personally dont think the press fit interference between the bearing and hub is correct with those conversion kits. Plus those hubs were not designed for sealed bearings.
Might just be my abusive riding though lol