Backfilling can take place 36 hours after the Xypex application. If backfilling takes place within seven days after the application, the backfilling material should be moist so as not to draw moisture from the Xypex coating.

Application of Paints, Epoxies or Similar Coatings

Xypex requires 21 days of curing and crystal generation before the application of any paint or epoxy. Washing the Xypex surface with a 3 - 5% muriatic acid solution is recommended before applying the coating. Be sure to flush all acid off the wall.

Application of Grout, Cement Parge Coat, Plaster or Stucco

It is important that any other cementitious system be applied over the Xypex coating before the Xypex crystals have had time to plug the pores of the concrete. Therefore, grouts, cement parge coats, etc. should be applied after the Xypex has completely set but while it is still "green" (8 to 48 hours). Use of a bonding agent is recommended. 

NOTE: Xypex Chemical Corporation makes no representations or warranties regarding the compatibility of Xypex products with plasters, stuccos, tiles and other surface-applied materials. It is the responsibility of the installer of these surface-applied materials to take whatever measures are necessary, including testing, to ensure acceptance by or adhesion to the Xypex treated surface. For more instructions, alternative application methods, or information concerning the compatibility of the Xypex treatment with other products or technologies, contact the technical department of Xypex Chemical Corporation.


Xypex is highly alkaline. 
  1. Avoid contact with skin or eyes. 
  2. Protect hands with rubber gloves when handling dry powder or wet mixture. 
  3. If skin comes into contact with Xypex material, wash immediately and thoroughly with water for 15 minutes. If discomfort continues, seek prompt medical attention. 
  4. Wear eye protection. If dry powder or wet mixture gets into eyes, flush immediately and thoroughly with water and seek medical aid. 
  5. Wear a suitable mask where there is potential for generating dust. If Xypex is ingested, do not induce vomiting; have affected person drink two glasses of water and obtain immediate medical attention. 
  6. For material safety data sheets, contact Xypex Chemical Corporation at 604.273.5265 or toll free 800.961.4477.