Q&A for How to Venetian Plaster

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Question

Can I apply Venetian plaster over drywall mud or does it need to be primed first?

Community Answer

You should always prime the drywall before applying any sort of non-industrial plaster.

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Question

Should a patch job on plaster be sealed first, then primed, then painted last?

Community Answer

Yes, especially if the patch is to repair water damage. Bin, a shellac-based primer, is best, as it will seal any water stain. If you are using an acrylic paint as a topcoat, use an acrylic primer. If the top coat is dark, the primer should be tinted, but you will still need at least two topcoats.

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Question

How do I clean Venetian plaster?

Matthew Drake

Community Answer

Normal soap and water is your best bet. If you have lime Venetian plaster and the the stain does not come out, you can try to lightly sand the surface with 1200 or 1500 grit sandpaper.

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Question

Why am I seeing black streaks after burnishing the last coat?

Matthew Drake

Community Answer

Likely you are not using a stainless steel trowel. A mild steel trowel will leave gray or black streaks. Stainless steel trowels are not easy to come by and will likely need to be purchased online or at a specialty retailer.

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Question

What do I do to prepare drywall before applying the materials that make the Venetian marble look finished?

Matthew Drake

Community Answer

Make the drywall smooth and as flat as possible. If bumps or level changes are in your drywall, they may telegraph through to the finish.

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