Negative Waterproofing


CRYST-O-SEAL is a ready-for-use(merely add water) concentrated, high strength, cement-based waterproofing slurry which provides excellent waterproofing by crystallisation to both sides of the substrate. It consists of a blend of cements, graded quartz and active chemical constituents. It is supplied as a fine, grey powder. The material waterproofs sound concrete or cement surfaces against water ingress, dampness, ground water and hydrostatic pressure.


CRYST-O-SEAL is an economical, easily applied method of providing a permanent waterproof barrier on concrete, cement, plaster and cement brick surfaces. It may be used on both new and existing structures on either the wet or the dry side.

CRYST-O-SEAL finds application in:

  • Foundations
  • Basements
  • Tunnels
  • Retaining Walls
  • Dams
  • Ponds
  • Pools
  • Silos
  • Sewage Plants
  • Underground structures