What materials are commonly used for the finish coat in plastering?

What materials are commonly used for the finish coat in plastering?

• A. All of the above
• B. Portland cement-based plaster
• C. Lime-putty
• D. Gypsum-based finish plasters

Answer: (A)

The finish coat is the final, thin layer that provides the smooth, paint-ready surface over the base coats. Different plastering systems use different materials for this top layer, depending on the project needs. Lime-putty finishes are traditional, very breathable and flexible, making them ideal for historic masonry. Gypsum-based finish plasters are popular for interior walls where a very smooth, fast-setting surface is desirable. Portland cement–based finishes offer greater strength and moisture resistance, suitable for exterior walls or damp interiors. Because each of these materials is commonly used as a finish coat, the option that covers all of them is the best answer.

The finish coat is the final, thin layer that provides the smooth, paint-ready surface over the base coats. Different plastering systems use different materials for this top layer, depending on the project needs. Lime-putty finishes are traditional, very breathable and flexible, making them ideal for historic masonry. Gypsum-based finish plasters are popular for interior walls where a very smooth, fast-setting surface is desirable. Portland cement–based finishes offer greater strength and moisture resistance, suitable for exterior walls or damp interiors. Because each of these materials is commonly used as a finish coat, the option that covers all of them is the best answer.