On Mon, 25 Nov 2002 [EMAIL PROTECTED] wrote: > Object - a vertial south sundial of 1700, in a sandstone type of material. > It is 24 inches square. with carved numerials and hour lines. > > Went tapped, an area about 12 inches diameter sounds hollow where a thin > surface area is detached from the backing of the 1.5 inch thich dial. > > Does anyone know how to secure this loose area to the sound stonework behind > ?. > > I quesstimate this loose area is about one eighth of an inch thick. > > Perhaps maybe drilling a tiny hole, and injecting some bonding agent. > > It is planned to do this work next year in warm weather. > > Your help much appreciated. David.
Just some preliminary thoughts... I would use something like an AirBrasive sandblasting pen to etch a hole, to minimize vibration and possibly additionally dislodging the loose layer. Once an opening has been made, perhaps you could place a dome over the hole, evacuate it as much as possible, and inject an epoxy binder. Letting the ambient air pressure return would help force the epoxy into the farthest parts of the cavity. There is a similar, proprietary process used to fill cracks in auto windshields, and possibly one of these services might be useful in actually effecting the repair. Dave 37.28N 121.97W -
