How to fill plaster cracks using an acrylic crack filler

Materials Required

. Acrylic Crack filler paste

. Putty blades/knifes

. Mason's toolkit

Application

. Identify cracks that are > 1mm and < 6mm. 

. Check for soundness of the plaster around the crack. Any loose plaster must be chipped off using a chisel or a stone cutting machine.

. Wire brush the crack and wash off dust and debris with a jet of water. 

. Prepare a primer for the crack by mixing the acrylic crack filler paste with water to obtain a paint like consistency. Apply the primer using a paint brush along the cracks and to about 25mm either side of the crack.

. While the primer is still tacky, fill the crack with the crack filler paste using a putty knife in direction perpendicular to the crack. The paste must be spread to about 25mm either side of the crack.

. Allow to cure for 24hrs.

. A second coat of crack filler can be applied to level the crack with the surrounding plaster.