Posted by Johnnie Meier on July 14, 1998 at 19:13:56:
In Reply to: porcelain sign restoration posted by alan riley on June 26, 1998 at 21:23:23:
: Does anyone know a sucessful method for cleaning rust stains, mold stains, and scratches off of porcelain signs?
Muriatic acid was recommended to me for removing rust stains. It is available at hardware stores and is some powerful stuff. You need a mask to block the fumes. It worked great on several signs but then I had a disaster on a chevron sign where the acid essentially ate the gloss away. Terrible. I have also used an automotive rubbing compound to remove rust stains but it is a lot of work. When it came to scratches, I tried a glass polishing compound that was meant to take scratches out of windshield glass. I had high hopes but it didn't work.