Pro-Struct 121 Multi-purpose Epoxy Adhesive is a adhesive for glueing steel, wood, fibreglass, cement, glass, ceramic products, mosaic and quarry tiles, grouting steel bars and bolts into concrete and repairing concrete spalls. May be mixed with a suitable filler such as silica sand, Pro-Struct 622, to give a thickener “putty” consistency. Indispensable repair material.