Foundation, Concrete and Earthquake Engineering

How to delay setting time of plaster?

At first I discuss why to delay plaster setting. Delaying is invaluable in hot weather or when you have a shortage of workers, when you often need more time to work the plaster before it sets. To do this without adding harmful agent, Fritz-Pak Corporation produces a unique product Plaster Delay-Set.

Plaster Delay-Set is an additive designed to slow down the set of plaster. It will not discolor or affect final strength of the plaster. Used as directed, one bag will retard the set of plaster for about one hour, depending on temperature. Up to three bags may be used. Contains no chlorides, nitrites, nitrates or clay. It is equally effective in white or gray cement.


-Plaster Delay-Set slows down the set time of pool plasters. 

-It does not weaken the plaster. 

-It does not contain chlorides, nitrites, nitrates, clay or other materials that may be hazardous to your workers or harmful to the plaster. 

-It does not discolor plaster. 

-Very easy to store and carry. 

-Easy and safe to handle by workers. 

-Plaster Delay-Set is packaged in a patented water soluble Fritz-Pak inner bag for convenient use at the job site.


Plaster Delay-Set is compatible with most concrete admixtures. When used with other admixtures, each one must be dispensed separately into the mix.

  • Item #95450: 10-oz (284-g) water soluble bag, 40 bags per case
  • Item #95451: 50-lb paper bags available for addition to prepackaged dry mixes
. One 10-oz bag for every 1000 lbs of plaster mix. This assumes a 60% sand/aggregate and 40% cement mix.

All Fritz-Pak Concrete Admixtures should be stored in a dry location, protected from breakage, deterioration and contamination. They are not subject to damage from freezing temperatures.

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