After seven months of this being in the shower, I haven't noticed any mold or staining. It fits great, doesn't wobble, and gets pretty wet at least twice a day. Since we have a walk-in shower the length of a normal bath tub, it sits at the far end and doesn't get drenched each time but still wet. I've rotated it 180' at least once this year to even out any wear, but I don't think that's needed.