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Using joint compound instead of plaster allows you to get a smoother wall surface with less manual effort. Keep in mind that joint compound is only ideal for gaps that are 1/8” or less. As it dries and sets, this drywall mud is also more prone to cracking.
Plaster of Paris and Joint Compound are two common materials used by homeowners for patching up holes and cracks in walls. It’s a pretty similar material, but there are some key differences between the two.
Joint compound and plaster are materials utilized in construction and home repair to smooth and finish surfaces, such as walls and ceilings. While they have some similarities, they also have some key differences in their composition and texture.
There are four types of joint compound: All-purpose: Used for all phases of the patching process. Topping: Used for final coat and typically spread onto a wall with two dried coats of taping compound. Taping: Goes over drywall tape and sets the seam between the drywall.
Joint compound, also known as drywall mud or plaster, is used is to fill in all the gaps and cracks in your walls. It is a mix of gypsum powder and water that turns into this smooth, paste-like substance. You slap it on with a trowel or putty knife and wait for it to dry.
While both joint compound and plaster serve similar purposes in filling gaps, covering imperfections, and finishing surfaces, they have distinct characteristics, compositions, and applications that set them apart.
Plaster, because of its properties and the fact that you cover the entire surface instead of simply making a raised mound over what you are trying to hide as with joint compound, allows the plasterer more leeway in utilizing trade secrets to create a more durable and uniform surface for paint.
The joint compound has lesser consistency, is more water-soluble, and is prone to shrinking and cracking. In contrast, plaster is thicker, water and fire-resistant, and shrink-free. Also, it has fewer pores, which makes paint sit well and makes the room better sound-proof.
Joint compound is the best option in most cases, but sometimes — such as when you're repairing a plaster wall — you need something that sets more quickly and creates a harder surface that won't sand away. Plaster of Paris, a material traditionally used by artists, is such a compound.
A joint compound is an essential construction element used to finish gypsum panel joints, corner beads, trim, fasteners, and skim coating. It helps patch up minor wall damage, such as holes, bumps, tears, and other minor imperfections.