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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. 

While every home has its own unique needs, ceiling drywall installation typically follows a staggered or stepped pattern to enhance structural integrity and reduce the visibility of seams. Starting from one corner, sheets are placed perpendicular to the ceiling joists, with the ends of adjacent sheets meeting along the center of the joist. The next row begins with a half sheet, ensuring joints don't align vertically. This alternating pattern, combined with proper taping and mudding, creates a seamless appearance and strengthens the ceiling structure, minimizing the risk of cracks over time.

Plaster is denser, harder, and more porous than drywall, so it absorbs moisture differently. This means you’ll often need more prep work, such as thorough sanding, patching, and priming with a high-quality bonding primer. Additionally, you may need more coats of paint to achieve even coverage. While the process takes more time, it helps ensure a durable and professional-looking result.

You can put drywall mud over paint to even out the surface or entirely resurface it. Sand the surface with 280-grit sandpaper, vacuum the debris and dust with a shop vac, and clean it with a slightly damp cloth. Allow the surface to dry. Apply drywall primer, especially if you’re skim-coating an entire wall. Apply the right type of drywall mud over the surface and smooth it with a trowel. Allow the layer to cure fully, then sand it before applying another layer or painting it.