What is the difference between plaster and spackle/joint compound?

compound Joint plaster spackle
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What is the difference between plaster and spackle/joint compound?

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Plaster provides a solid, seamless surface. It may be applied over wire lath, as found in many older homes, as well as over sheetrock. Spackle, or joint compound, is used to cover the taped seams of sheetrocked walls.