Natraseal is a specially formulated penetrating water repellent sealer suitable for any porous masonry surface especially sandstone, terracotta, brick, clay, stone and concrete. Natraseal is a clear invisible coating that does not alter the natural appearance of the surface.

Natraseal has a low surface tension and flows readily into minute capillaries and the surface cellular structure of porous substances. The treatment penetrates up to 6mm, depending on surface porosity. Weathering does not affect the water repellency properties of Natraseal.  After application the solvent evaporates and deposits an invisible film of silicone on the internal surface of the substrate.

Silicones are synthetic materials and have properties of both organic polymers and inorganic silicates like quartz and sand. Because of their close relationship to masonry building materials, silicones bond well to such surfaces. Silicones are natural hydrophobic (water hating) chemicals; even minute quantities repel moisture, and keep water from entering porous surfaces for years. Natraseal does not clog the pores, but allows the passage of water vapour. Areas treated with Natraseal can still breathe so that dampness can dry out. Natraseal treatments properly applied are known to be effective for at least 7 years.

Contrary to popular belief, terracotta, clay, natural stone and concrete are not waterproof. Rainwater and particularly rainwater driven by strong winds easily penetrates such materials. Rainwater penetration through exterior surfaces can cause minor discomforts and annoyances such as efflorescence or salting. Most importantly, it can also cause extensive damage to paint, floor coverings, equipment and merchandise.

Natraseal treated areas repel water.  Airborne dirt remains on the surface to be washed away by rain.  Fungus growth is discouraged. Possible corrosive chemical action is prevented and costly cleaning is not required.

After application soluble salts are suppressed and remain at the lowest point of silicone penetration. On untreated surfaces soluble salts show up as white, green or yellowish brown deposits.

Surface preparation of both new and old surfaces is important:
a.    Repair all cracks and rejoint faulty joints. Natraseal will not waterproof holes or open cracks larger than hairline cracks.
b.    Remove dirt, moss, algae, fungus, loose particles and paint preferably by water blasting.
c.    Natraseal should only be applied on dry days.  Avoid treating surfaces which are noticeably damp and ensure that treated surfaces will be free of water for at least 6 hours.  If surface is visibly dry it may be treated with Natraseal.
d.    Natraseal can be applied by spray, soft broom, brush, roller or the preferred applicator which is a lambs wool pad.
Natraseal should be applied in sufficient quantities to allow it to soak well into the surface.  The deeper the penetration the more effective it will be.  For this reason 2 -3 heavily flooded applications will produce far better results than multiple light applications.  The quantity of Natraseal that will be absorbed and the depth to which it will penetrate depends on the porosity of the area being treated.

Wash equipment after use with mineral turps. However, application equipment once used with Natraseal should only be used again with similar silicone based products.