Features and Benefits

Crystalizing coat for waterproofing of buildings and structural components


  • waterproofing through crystalisation
  • resistant to positive and negative water pressure
  • seals hairline cracks in the concrete
  • structure up to 0,4 mm
  • strong reduction of capillary absorption of water
  • cooperates with the sealing tape
  • vapour-open
  • frost resistant
  • economical application
  • can be applied by brush or trowel

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Ceresit CR 90 Crystaliser works in two ways – it forms a waterproofing layer on the surface of the substrates and additionally, during the structure exploitation, it builds crystals in the substrate’s pores. This process leads in time to the complete closure of capillarity routes, which finally eliminates the water transport in the concrete, in both directions.

CR 90 can be used for waterproofing non-deformable, crack-free mineral substrates such as concrete, brick-work, renders and screeds, for example for pedestals, underground parts of the buildings including basement walls, sewage treatment plants and water tanks (including drinking water tanks) with a water depth up to 15 m. It is also suitable for waterproofing small, monolithic swimming pools up to the size of 20 m2.

Ceresit CR 90 Crystaliser is a part of Ceresit cementitious slurries range with Hydroslide Effect.

Step by step

Substrate preparation


Ceresit CR 90 adheares to load-bearing, solid and clean surfaces, free from any substances that decrease adhesion (such as grease, bitumen, dust), namely: – Concrete with a minimum class of C 12/15 (over 3 months old), – mineral plasters (cement, cement-lime) with the thickness of >10 mm and cement screeds (strength >12 MPa, over 28 days old) – brickwork with full-joints, and the strength of >6 MPa (over 3 months old). Surfaces must be smooth, absorbent and porous. Dirt, existing layers of low resistance and all previous paint coverings, lime plasters, and substances that impede adhesion must be carefully removed . Corroded joints should be removed up to the depth of 2 cm and refilled with cement mortar. Deep holes and uneven substrates should also be repaired with cement mortars or concrete. The edges should be chamfered to approx. 3 cm, whereas corners should be rounded (with the cement mortar or CX 5 mixed with sand) to a radius of least at 4 cm. CR 90 requires the pre-wetting of the substrates before application to the mat-wet conditions (without puddle formation).



Sprinkle CR 90 into clean, cold water and mix (using a mixer) until the homogenous mass without lumps is obtained: – for brush application – use 8 l water per 25 kg CR 90, – for trowel application – use 6 l water per 25 kg CR 90. The layer should be applied on the damp but not wet substrate. The first layer of CR 90 should be applied crosswise with a brush, the second layer can be applied by brush or a trowel. Apply the second layer only when the previous one is already hardened but still damp. Protect surfaces against too rapid drying. The coating can be walked on after 2 days, however, even after complete hardening the coating must not be directly exposed to heavy mechanical loads.