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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. 

The short answer is yes, a sagging plaster ceiling is dangerous. Sagging plaster on a wall is something you should fix immediately, but it isn’t a major concern. If the same type of sagging occurs on a ceiling, however, you could be in danger of your ceiling falling in large chunks. When plaster sags, it loses its strength and ability to hold itself up. The bonds that hold it together are strong, though, so if a sagging area falls, it will take large pieces down with it.

On average, repairing a ceiling costs anywhere from $450 to $1,750. However, there are many variables that can impact the price of this project. For example, the type of ceiling material, type and extent of the damage, and local labor rates all affect your costs. Holes and cracks are less expensive to fix, while structural issues and water damage are pricier problems.

You can apply plaster over plaster, but before you do, check the stability of the existing plaster. If it’s been there for a while, it may require a base coat of PVA emulsion. This will make the existing plaster less porous and ensure the new and old plaster adhere properly.