Drywall finishing compound, also called joint compound or just "mud," is essential for filling the joints between drywall panels which builders use in constructing of ceilings and walls. When the panels are in place, the drywall contractor smooths finishing compound into the seams and over screw-head dimples to create a flush wall surface. The finishing process needs several applications of compound to achieve the best results.
Powdered vs. Premix
Shopping for drywall compound can be confusing at first so it helps to know that there are two basic types of compound, powder and premix. Within those two categories, variations exists that affect drying time, stability and the texture of the compound.
Just about any compound you can find in premixed form is also available in powder form. Premix is ready to go, right out of the container, and it is smooth and lump-free. Powdered compound requires extensive mixing but it is less expensive and you may mix up small batches as needed, which saves money.
Variations
The most commonly used type of drywall finishing compound is the standard taping, or "setting," mix. Drywall contractors use this to fill the seams between drywall panels and smooth over dimples.
In addition to the standard taping compound, you can find a "topping" mix that features a finer grain, making it optimal for the final taping application. Topping compound, however, isn't sturdy enough to fill the gaps between drywall panels.
For those who want to use just one compound, an all-purpose compound fits the bill. This compound combines the fine texture of a topping compound with added strength. Some drywall contractors use it exclusively for all their taping needs.
Fast Drying
Whether you're applying the first coat of mud or the final coat, you can choose a compound that dries very quickly. Fast-set compounds are often better left to the pros who can apply and smooth the compound quickly. If you're a cautious taper, the mixture can harden before you're finished.
Considerations
No matter what kind of compound you're using, you'll get better results if you apply multiple thin coats instead of one thick coat. Drywall compound shrinks slightly as it dries and a thick coat can warp and leave lumps and bumps on your wall.
If you're an inexperienced taper, opt for an "easy sanding" compound. New tapers often leave streaks and ridges of compound on the walls. The easy sanding variety makes it simple to smooth away the rough spots with a drywall sander before adding another coat or before painting the wall.
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