Question 1

How much coverage is one gallon of Venetian plaster?

Accepted Answer

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This depends on how much plaster is applied and in how many layers, but a decent estimate is around 150 square feet. If you are applying only two coats on a small wall, there is a chance you may only need one or two gallons for the entire project. If you are plastering a large living room wall with high ceilings, using one of the more involved techniques–like Scagliola–that requires several coats, expect the project materials costs to add up quickly.

Question 2

What is the difference between spackle and joint compound, and which should I use for drywall repairs?

Accepted Answer

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Although they have similar applications, spackle and joint compound are not the same. Their primary differences lie in their composition, consistency, and ideal use cases.

Spackle is composed of gypsum and binding agents, making it thicker than joint compound. It dries quickly and is easy to sand, which makes it ideal for small wall repair projects like filling nail holes or patching minor damage.

Joint compound, also known as drywall mud, consists of limestone and gypsum. It is primarily used for large-scale projects, such as taping and finishing the seams on newly installed drywall. It tends to shrink more than spackle and can be more difficult to spread.

While both products can be used to fill small depressions and cracks, spackle cannot replace joint compound for taping and mudding new drywall. Conversely, you can often use joint compound for small patching jobs typically done with spackle.

Question 3

How long does plaster take to dry?

Accepted Answer

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Drying alone can take 1 to 4 hours to dry to the touch per plaster layer, but some types of plaster take several hours longer to dry. However, this doesn’t mean the job is done because plaster doesn’t fully harden until it cures, which can take a few days to a couple of weeks. It may take even longer if you’re building a new, pretty thick plaster wall. Allow the plaster to cure before painting it.

Question 4

Does mounting a TV damage the wall?

Accepted Answer

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You will be placing holes in the wall to hang the mounting bracket. If you’re mounting a large TV, the bolts in use could make significant holes around half an inch in diameter. Other than a few holes, though, the process of mounting the TV should not cause significant damage to the wall, unless you make an error and miss the wall stud, tearing out drywall. Should you decide to remove the mount later, the DIY drywall repair cost for a small hole usually is $10 to $30. It’s a repair you can do in a few minutes.

Question 5

Can you plaster over regular drywall?

Accepted Answer

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You can plaster over regular drywall, but it's essential to prepare the surface properly. Before plastering, the drywall should be clean, free of dust, and any loose or peeling paint should be removed. Applying a primer specifically designed for plastering can improve adhesion. Some professionals recommend applying a base coat of plaster or joint compound to create a better surface for the plaster to adhere to. Proper preparation ensures a smooth and durable plaster finish over regular drywall.