• USG Gypsum Plaster Retarder — Standard Strength is recommended for slight to moderate (30 to 45 minutes) lengthening of set t

USG Gypsum Plaster Retarders extend the set time of conventional plasters, veneer plasters, lime finish plasters and setting-type joint compounds. By slowing the chemical crystal formation that causes gypsum plaster to set or harden, USG Gypsum Plaster Retarders allow more time to complete each job. USG Gypsum Plaster Retarders easily disperse into water prior to adding plaster