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Joint compound can also be used to cover screw heads and fill small holes.
Drywall Compound, Mud
Most carpenters estimate the amount of joint compound needed by dividing the square footage of the space by 7.25. They would then buy that many pounds of joint compound. Each 45 pound pail costs around $14.
Costs vary greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.