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Using trowels, fill mortar lines with AcrylPro Ceramic Tile Adhesive, feathering out the edges and blending to to blend smoothly with the surface.
Before the surface dries, use damp sponges to smooth it further. Let dry.
Trowel on a thin coat of Marmarino plaster to cover the entire surface.
As the plaster begins to set, smooth and polish the surface (burnish) with the flat side of the trowel. Let dry.