Ok, I'm confused. I tried assembly lube, the white injection system tube stuff. It was still stiff and hard to move. Solved it a few times a day for a week with no improvement. I got some Pyroil Multi Purple silicone spray (the auto store didn't have any CRC) and I spritz that in, two small spritz one on each side of the core. I work the heck out of it, but I am not a speed solver (takes me 3 or 4 minutes to solve the cube) so it was mostly turning each face one quarter turn then switch to a new face and bounce around like that hitting all faces for several minutes. Still stiff and binding a lot. So I start to dismantle it to lube the core, like it says on Lubix. What I find is not pretty. There is *light* dusting of fine black powder on the core and I see one or two of the edges are messed up. Don't have a camera or I'd photo this for you to see. Assembly lube I'd assume is safe and I *thought* silicone spray was safe too so I am confused by what messed up my cube.