Slows the setting time of gypsum plasters
Recommended for minor to moderate lengthening of set times
- Use to slow the setting time of gypsum plasters.
- Mixes easily with plaster.
- Convenient 1 3/4 lb. package.
Plaster Retarder is recommended for minor to moderate lengthening of set times of our plaster products. Plaster Retarder slows the setting time of gypsum plasters. Due to job conditions or situations, the plastering contractor may need to alter the setting time to allow for suitable application and finishing.
The addition of disproportionate amounts of Plaster Retarder will drastically reduce strength, thereby impairing the quality of the finished work. Disproportionate amounts may produce a “dry-out” situation (the failure of plaster to set before the water essential for chemical reaction evaporates).
Do not add Plaster Retarder directly to your plaster mix.
Before the use of any additive, good practice involves mixing a trial batch of plaster products to determine the actual job site set time. Once the set time is known, a measured amount of Gold Bond Plaster Retarder/water mixture is added to adjust the set.
Plaster Retarder should be fully dissolved in water before adding to plaster. Mix one teaspoon of dry plaster retarder with five fluid ounces of water to make a solution that will extend the set time of 50 pounds of Uni-Kal®, X-KALibur®, or Kal-Kote® plasters by about 15 minutes. Mix one teaspoon of Gold Bond Plaster Retarder with five fluid ounces of water to extend the set time of 100 pounds of conventional gypsum plaster products like Two-Way Hardwall or Gypsolite® by 1 to 3 hours. For larger quantities, mix an entire 1-1/2 lb. container of Plaster Retarder with 5-gallons of water in a container to prepare the solution. Slowly add retarder to room temperature water and stir until the retarder is dispersed (not dissolved). With the use of a screen, remove any lumps that may have formed. These lumps will cause soft discolored spots on the plaster surface. Always stir the retarder mixture before using. Poor dispersion increases the possibility of erratic set time and soft unset spots in the plaster surface.
Important: Clean mixing containers and tools with water immediately after use, and partially used containers should be closed as tightly as possible. Keep Gold Bond Plaster Retarder in a cool, dry place. Avoid direct sunlight. Maintain temperature above 40°F (4°C). Shelf Life: Up to 12 months under protected storage conditions. Rotate stock.
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