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Cementitious Liquid Membrane :  

Crystoseal is a ready-for-use (merely add water) concentrated, high strength, cement-based waterproofing slurry incorporating active chemical constituents which, when applied, become active in cementitious substrates and by a  crystallization  process provides a waterproof seal within the substrate. Crystoseal waterproofs sound concrete or cement surfaces against water ingress, dampness, ground water and hydrostatic pressure. Crystoseal is suitable for waterproofing both the positive and negative sides of the substrate.
It consists of a blend of cements, graded quartz and active chemical constituents and gives a render-like appearance. Crystoseal works by the conversion of free lime in the concrete to insoluble calcium compounds. These seal against capillary ingress of water. Compounds within Crystoseal penetrate in to the substrate where they in turn 'crystallise' on contact with moisture and create a waterproof barrier. 


Crystoseal is an economical, easily applied method of providing a waterproof barrier to sound and stable concrete or cement based products such a cement filled block work. It may be used on both new and existing structures. Crystoseal finds particular use on concrete structures where access is only available to  negative side of the structure such as the internal side of retaining walls.

Suitable Surfaces

Crystoseal finds applications in concrete or cementitious substrates such as:
Foundations, basements, tunnels, retaining walls, water retaining structures, ponds, pools, silos and underground structures.


The information contained in this product data sheet is typical but does not constitute a full specification as conditions and specific requirements may vary from project to project. The instructions should be considered as a minimum requirement but the applicator or contractor must use their skill, knowledge and experience to carry out additional works as may be necessary to meet the requirements of the project. Specification for specific projects should be sought from the Company in writing. 


Crystoseal is formulated for concrete and cementitious substrates only which must contain high levels of concrete or cement. Crystoseal acts within the tissue of the substrate and is dependent upon its soundness. If the substrate cracks, then the Crystoseal will crack in sympathy and it will not seal or bridge cracks. Cracks and joins must be independently waterproofed by alternate means before applying Crystoseal. 
Crystoseal relies on the soundness and density of the substrate. If the substrate contains internal or external voids or is honeycombed then the effectiveness of the product may be negated or diminished. It is highly recommended that block work be filled and compacted.
Crystoseal must not be exposed to water pressure, running water or rain until it has set. 
Crystoseal is not a vapour barrier.
When sealing the negative side of a structure, if there is hydrostatic pressure or a build up of water on the other side of the structure, there is a risk that water will find other areas of penetration. 
Since the Crystoseal system is based on a chemical reaction taking place inside the concrete, some moisture penetration can be expected until voids are sealed by the crystallisation process which can take some time.
Crystoseal is dependent upon the application of sufficient product to effectively convert the free lime in the substrate. 

Benefits and Advantages

Crystoseal has application where conventional membranes would be unsuitable such as:
On damp cementitious surfaces.
There is only access to the negative side of the structure, i.e. inside surface of a retaining wall or outside of water retaining structures.
Easy to use. Simply add water, mix and apply by brush or roller.

Precautions in Use

Crystoseal must not be exposed to water pressure, running water or rain, until it has fully set. The treated surface must be protected from heat and wind and drying should be as slow as possible. 
Note: Since the Crystoseal system is based on a chemical reaction taking place inside the concrete, some moisture penetration can be expected until voids are sealed by the  crystallization  process. Refer to Limitations above.

Priming and Surface Preparation

Good preparation is essential. Surfaces must be sound, stable, dry, clean and free of dust, loose, flaking, friable material and substances that may diminish adhesion.  

Crystoseal is designed for use on porous, concrete or cementitious surfaces.

All surfaces must be clean, sound, free of laitance, form work release agents, paint, coatings, dust, loose particles and any other foreign matter including fungal growth. Crystoseal must be applied directly to the clean concrete surface.

Large cracks and honeycombing should be made good with thin coating of Crystoseal mixed as described below and then be filled with a non-shrink mortar prior to applying the overall Crystoseal treatment.

A fillet should be formed using Crystoseal in a slightly stiffer version in all floor/wall joints prior to applying the Crystoseal in the specified manner.

Crystoseal only needs the addition of water to be ready for use. Mix Crystoseal with water to produce a viscous, creamy consistency (1 part clean water to approximately 2.5 parts Crystoseal). Mixing may be done by hand or mechanical mixer and should be continued until a homogenous, lump free product results. In manual mixing lumps may be broken down with a gloved hand. On completion of mixing, material must be used within 30 minutes.

Never attempt to reconstitute the mixed product by further dilution after mixed material has become too stiff to apply. Discard this product.


Any surface to be treated with Crystoseal must be fully saturated with water beforehand, preferably the day before. Surfaces such as floors must be free of ponded water or running water and verticals must be free of water running down the face. Apply Crystoseal using either a medium-hard block brush, trowel, broom or roller.
Treatment must be applied in a minimum of two or three coats as indicated below. A second coat must be applied as soon as the first coat can no longer be disturbed by brushing. If a third coat is required it must follow within 24 hours, with the surface having again been pre-dampened.
The final coat of a system, be it two or three coats, must be left as smooth as possible.

IMPORTANT: The applied Crystoseal  must be protected from heat and wind and drying should be as slow as possible. Do not let the surface dry quickly and can be sprayed with water to dampen it.

Do not attempt to reconstitute the mixed product after it has become too stiff to apply by adding water. This product should be discarded.


The stated average coverage rate may vary depending upon type, condition, porosity, texture of the surface and application technique.  

For waterproofing external surfaces against water ingress from damp earth and mist ground apply a minimum of two coats applied at 1kg to 2 kg per m2 per coat. 
Waterproofing internal surfaces against rising damp up to 1m head of water apply a minimum two coats applied at 2kg to 4kg per m2 per coat. 
Waterproofing water retaining structures internally apply a minimum two coats applied at 2kg to 3kg m2 per coat. 
Waterproofing externally against more than 1m head of water pressure apply a minimum of 3 coats applied at 2.5kg per m2 per coat.


Crystoseal has a 'cement' colour and gives a render-like finish.

Drying and Curing

Drying and curing of the product is affected by type, dryness and porosity of the surface, temperature, humidity, ventilation, climate conditions and application technique and therefore drying and curing can only be given as a guide.  

For best results drying should be as slow as practically possible. Post dampening is an advantage.


Stores in dry, cool areas. Damaged bags or material that is water or moisture effected should not be used. Available in 20 kg bags.

Clean Up

Water, as for cement.

Tiling, Topping or Top Coating

Generally Crystoseal is not topped. 
If area is to be topped, then adequate time should be given to ascertain that the desired effect has been achieved and then should be membraned by priming with Duram Primeseal followed by the application of the selected Duram waterproofing membrane such as Durabit EF, Durabit REO, Multithane, Duram 195 or Crystoflex.

If area is to be painted, then adequate time should be given to ascertain that the desired effect has been achieved and then primed with Duram Primeseal and then painted.



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