Ensures excellent water-repellency and longterm protection. Suitable for sealing tile joints and protecting a variety of surfaces, including natural and synthetic stone, unpainted render, exposed masonry, decorative bricks, roof tiles, tiles, exposed concrete, etc., against rain damage. Applicable also to damp substrates. PS-21is a ready-to-use, water-based impregnation containing a mixture of silanes and siloxanes, used for hydrophobic treatment, of inorganic substrates.

Substrate

The surface to be treated must be clean and have an open capillary system.

Application

a) Horizontal surfaces

In case of horizontal absorbent  surfaces (absorbent tiles, terrazzo, etc), the application is carried out with a squeegee. The material is left to act for5 minutes, next the excess material is removed using a squeegee. The material is left to act for 5 minutes, next the excess material is removed using a squeegee and the surface is cleaned with a damp cloth. The final cleaning of the surface can be done after 6 hours. Hydrophobic treatment is more effective on surfaces with adequate slope without standing water.

b) Vertical surfaces

For vertical surfaces, PS-21 is applied by spray, brush or roller. One or two layers are usually sufficient. The second layer is applied while the first is still fresh. Better impregnation is achieved on dry or damp absorbent substrates.

c) Waterproofing of tile joints

The application of PS-21 for waterproofing tile joints can be done by brush or squeegee.

d) Impregnation

PS-21 can be used also for the impregnation of building materials like tiles, bricks, etc., diluted with water in a ratio of 1:1 to 1:4.