How to Apply Venetian Plaster to Walls

Venetian plaster is applied in three thin coats using a trowel, with each layer sanded smooth and the final coat burnished to create a polished marble-like finish.

1. Perfect Walls Begin Here. Clean the wall thoroughly and fill any holes or cracks with spackling compound. Sand the entire surface smooth with 220-grit sandpaper. Prime the wall with a high-quality bonding primer and let it dry completely. The surface must be perfectly smooth since venetian plaster will highlight any imperfections.
2. Mix Your Perfect Shade. Add your chosen colorant to the venetian plaster base according to manufacturer instructions. Mix thoroughly with a paddle mixer attachment until the color is completely uniform. Test the color on a small hidden area first, as it will appear slightly different when dry and burnished.
3. Lay the Foundation. Load a small amount of plaster onto your trowel and apply it to the wall using random, overlapping strokes in different directions. Keep this first coat thin and work quickly to maintain a wet edge. Cover the entire wall surface, leaving visible trowel marks. This base coat should be completely opaque.
4. Smooth the Surface. Once the first coat is completely dry (usually 4-6 hours), lightly sand the entire surface with 400-grit sandpaper to remove any high spots or ridges. Wipe away all dust with a tack cloth. The surface should feel smooth to the touch.
5. Build Depth and Dimension. Apply the second coat using the same technique as the first, but with slightly more pressure and longer strokes. This coat should partially fill in the trowel marks from the first layer while creating new texture. Work in smaller sections to maintain control and blend seams carefully.
6. Refine the Texture. After the second coat dries completely, sand again with 600-grit sandpaper, focusing on smoothing any rough areas. Clean thoroughly with a tack cloth. The surface should now have a subtle texture but feel relatively smooth.
7. Create the Polish. For the third coat, apply very thin amounts of plaster with light pressure, using long sweeping motions. This coat should be almost transparent in some areas, allowing the underlying texture to show through. Work quickly and blend all edges while the material is still workable.
8. Unlock the Marble Effect. Once the final coat begins to firm up but is still slightly damp, burnish the surface using the flat edge of your trowel held at a shallow angle. Apply firm pressure and use overlapping strokes to compress and polish the plaster. This creates the characteristic glossy, marble-like finish.
9. Lock in the Shine. After the plaster has cured for 24-48 hours, apply a clear protective sealer designed for venetian plaster. Use a high-quality brush or roller to apply thin, even coats. Two coats of sealer will protect the finish and make it easier to clean.