I'm afraid I know the answer to this, but I have a small (1/2-inch to 1 inch) hairline crack in the bottom right corner of my toilet tank, which drips slowly. Is there a way to patch the porcelain so I won't have to replace the entire toilet? BTW, my regrouting project in that bathroom is DONE!!!!! (well, I could do more, but the shower enclosure is done!!) Now I need to find a way to cut a replacement piece of plastic diffuser for my flourescent light enclosure --it's an odd size opening (12 by 46). A sharp utility knife and masking tape did NOT work--the plastic was too brittle. Ideas? Thanks!! -- Mary M. Oak Ridge, TN