Concrete Solutions for architects, engineers and builders since 1974

StarSeal EF Hardener 204

STARSEAL EF HARDENER 204 is a water white silicate based solution that produces chemical hardening of concrete surfaces. It is formulated with proprietary additives to encourage maximum penetration and to minimize dusting.


  • Provides for complete development of concrete’s wear resistance and strength properties
  • Reduces dusting
  • Allows for bonding of all finishes
  • Rehabilitates old worn floors by chemically reacting to provide a hard and durable surface
  • Meets requirements of Federal Specification CE-204
  • Economical


Gurad/Film Forming Sealers

Penetrating Sealer and Concrete Curing in one easy-to-use product.