Lustrous finish of Venetian plaster technique
Venetian plaster refers to a method of applying plaster to a wall or other architectural feature, giving it an appearance of marble or stone and lending it a classical, Renaissance look. You can use one of several types of plaster--all of them require tinting. A skilled workman applies the plaster in thin layers with drying time between applications. Finishing techniques, such as buffing and waxing, complete the process. Many artisans train for years to learn the traditional methods for applying plaster in the Venetian custom. However, with a little practice, you can learn to do it yourself.
Priming
Remember to apply a primer to the surface to be plastered; otherwise the plaster may not adhere correctly. Second, buy the premixed plaster in plastic buckets from a home improvement store. This will save you from spending time mixing dry plaster.
First Layer
Before adding the desired color to the plaster, pour off any excess water and stir the plaster in bucket to reduce viscosity. A drill-driven stirrer attachment works best. For the first layer, apply the plaster without any color additives to build up the foundation. It is important to use the correct tools for applying the plaster, so for the first layer use a standard plastering trowel and hold it at a 15-degree angle while applying a flat, even layer of plaster to the wall.
Tinting
When adding the colorant, use the stirrer attachment again, then wait 12 hours or so until the right consistency is achieved, which is a putty-like texture.
Second and Third Layers
For the next two layers, use a stainless-steel spatula to apply the tinted plaster. Hold the spatula at a 30-degree angle for the second layer--also a flat, even application. After 10 hours of drying time, apply the third layer with the same spatula, but apply using a 45-degree angle. Sweep the trowel in arcing motions to create an interesting texture. Run the spatula over the third layer with some pressure to polish the finish. You should be able to see yourself reflected in the plaster.
Wax Finish
Finally, apply a wax layer 48 hours later, using a wax manufactured for the purpose. Wipe the wax on with a sponge and apply as many coats as it takes until the plaster stops absorbing more wax. At that point, polish the surface with a non-woven cloth, then buff it out with another non-woven cloth.
Corners, Joints and Other Details
There are special processes for applying the plaster to corners and drywall joints, as well as edges at the ceiling and floor. For these techniques, it is best to take instruction from a professional plasterer, or at least watch videos on the subject to see the specific steps involved.
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