How Do I Mix Plaster and Joint Compound?


Quick Answer

Plaster and joint compound mix, known as setting-type compounds, require water. The different types of setting-type joint compounds require various water-to-mix ratios and take different amounts of time to harden.

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Full Answer

Setting-type joint compound is usually a dry mix and comes in a bag or bucket. The bag or bucket will include the ratio of water-to-mix. The amount of mix and the amount of water depends on the size of the job.

The type of compound also determines the length of drying time required.

  • "Easy sand" often takes 45 minutes on average to dry to complete hardness.
  • All-purpose compound dries in 24 hours.
  • Topping compound for quick fill of cracks comes with five- to 20-minute drying times.
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