How to Apply Polished Plaster

Want to learn how to create a highly polished venetian plaster wall? You can do that with a few simple tips:

Steps

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    Ensure the surface you're going to apply the decorative plaster is flat and smooth with no abrasions. If it's a gypsum plastered wall, then use a fine filler to repair any blemishes and sand where necessary.
    • This step is vital, as a stucco venetian plaster is very thin and any imperfections in the wall will show through.
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    Prime the wall to to give the plaster something to key to. Leave the primer 8 hours to dry before applying the first coat.
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    Use a mirrored trowel (smaller the better for stucco) to apply the stucco. Work in a random manner across the surface starting at one side/corner and then going across. Try to keep the first coat as flat as you can, but it doesn't have to be perfect. Ensure the whole area gets an even coating.
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    Give the dry first coat a very light sand using high grade paper about 320 grit. This is very quick; an area of one square metre should take 10 seconds.
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    Apply the second coat of stucco the same way you did the first. Try for an even coating, but bear in mind now the patterns you put in with trowel will come through the last coat and give it some character.
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    "De-crud" the surface. Once covered and the plaster is immediately starting to dry, trowel over the surface to take off any high spots of plaster.
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    Leave the wall to dry for a minimum of 8 hours.
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    Sand the surface very lightly and gently across surface.
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    Repeat one more coat of stucco. Once the coat is on, give the surface a gentle troweling up to start creating a shine. If you feel the trowel is gripping then leave a short while for the plaster to harden a bit.
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    Start to work your trowel over the surface in random directions. The ideal time to do this depends on the surface and conditions, but usually within 1 hour of stuccoing. As you work, look across the surface and you will begin to see shine points all over. Continue this until satisfied with the finish.
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    Protect the finished surface with either a wax or lacquer. Follow the instructions of either product; normally, you'll want to trowel on any wax and brush/ roll on and lacquer. The lacquer is now finished, but once dried out, the wax can be rubbed with lambs wool to create an even higher shine.

Tips

  • You can use a mechanical buffer to polish up the wax but it really isn't necessary. Using your hand and wool will give it a very good shine.


Warnings

  • Be careful with the trowel's edge. Mirrored trowel used for venetian plaster become much sharper than normal gypsum finish plaster trowels.

Article Info

Categories: Home Decorating