Try colloidal silica like LUDOX PX 30. This is widely used as a binder
for repair mortar used in the loss compensation of stone, and even in
foundry to strengthen molding sand. The material is water based, easy to
use and not expensive.
Best regards,
Olaf Pung
Steinrestaurierung
Diplomrestaurator,
Meister im Steinmetzhandwerk
Mendiger Str. 9
D - 56743 Thür
www.olaf-pung.de
Fon+49 2652 959 222
Fax -200
mobil +49 177 6040443
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