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Joint Compound is the gypsum based product that is used to tape and finish drywall. Examples are USG green lid all purpose. Blue or lime lid USG Lightweight.Also setting type joint compound is powder in bags "durabond" or "sandable" is a product that hardens by chemical reaction like plaster or concrete does when mixed with water. The number on the bag is the number of minutes until it hardens. available times are 5 minute,20 minute, 45 minute,90 minute, 220 minute. **Caution** Most joint compound contained asbestos prior to 1980.**Caution**

Source: Jason Lebeau a 24 year drywall industry veteran.