Surface Treatment

Water Repellant Sealer

Monneli Idrosil XS

Solvent Based Silane-Siloxane Penetrating Water Repellant Treatment

IDROSIL XS is used as a colourless surface protection for the following:
Reinforce concrete structure
Cementitious substrate masonry
All types of structures including those in coastal environments
New and existing concrete
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Technical Information
Product Description

IDROSIL XS is a single component penetrating Silane Siloxane treatment which penetrates into porous substrates and then reacts with moisture or pore water from the substrate to form a hydrophobic polysiloxane lining to the capillaries without clogging the pores or capillaries.

  • Excellent penetration and water repellant characteristics
  • Protects surface from discoloration and weathering
  • Non staining
  • Reduces water and chloride intrusion
  • Reduces efflorescence
  • Breathable; Allows interior moisture to escape without damaging the sealer
Packaging, Coverage / Consumption


IDROSIL XS is packed in 20 & 200 Liter Drums.




Shelf Life & Storage


Store under cover, out of direct sunlight and protect from extreme temperature. If properly stored, the product has a shelf life of 12 months from the date of manufacturing.

Technical Properties



Colorless liquid

Density at 25°C

0.80 kg/L


9 cps

Flammability point


Temperature of application

from +5°C to +35°C

Overcoating time

Wet on wet application. Second coat can be applied immediately 

Harmfulness according to EEC 88/379

Harmful for contact 

All values are subject to 5-10 % tolerance

Application Information
Instructions for use

Surface Preparation

All surfaces should be clean, sound and uncontaminated.

This preparation should leave an exposed concrete, free from dust, loose particles, deleterious matter, oil, grease, chemical films and other contaminants.

This is best achieved by lightly sandblasting the surface where moss, algae or similar growths have occurred. Treatment with a recommended biocide should be done after sandblasting process.


Test a small area of the surface (generally 1.0m x 1.0m section) before starting application of the sealer to ensure desired performance results, aesthetics & coverage rate. Allow 5-7 days for the product to fully react.


IDROSIL XS is a single component, applied at full strength and never diluted. Can be used directly from the container, no mixing is required but stir first before use. Apply by brush, roller or low-pressure spray.

On vertical surfaces, IDROSIL XS should be flooded starting at the bottom working steadily upward.

For aggressive contamination, it is preferable to slightly sand blast the surface. Algae growth, if exists, should be treated with recommended biocide.

When used as a protective impregnation, a minimum of two applications is recommended. Thus, apply the second coat is still wet.


Equipment and tools used should be cleaned with SOLVENTE 10 immediately after use.


  • Prolonged contact with air should be avoided
  • Containers should be sealed when not in use
  • Ensure adequate ventilation
Additional Information
Health & Safety

IDROSIL XS should not be swallowed or come in contact with skin and eyes. Inhalation of spray should be avoided.

Wear protective clothing, goggles/masks and gloves during application.

Should accidental contact with skin take place, wash thoroughly with soap and water.

In case of contact with eyes, rinse with plenty and immediately seek medical advice.

If ingested, obtained medical attention immediately. Do not induce vomiting.


IDROSIL XS contains flammable solvents. All the precautions must be foreseen for use of such kind of products. For further information or particular use, contact our Technical Department.

Important note

The information in this Technical Data Sheet is based on Colmef Monneli’s experience. Colmef Monneli does not accept any liability arising from the use of its products as it has no direct or continuous control over where or how its products are applied. All Colmef Monneli’s Data Sheets are updates on regular basis. It is the user’s responsibility to obtain the latest version.

additional materials
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Technical Properties Sheet
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