Product review (2 stars): Smears and leaves marks where it isn't even
I tried this so I wouldn't have to clean my ceramic stovetop so often.  I followed the directions and I thought I had gotten it on evenly but didn't and it left marks which I then had to scrub off.  I may try it again and try to get it on evenly.  It was very difficult to scrub off and so I'm not sure a "protectant" is even necessary.