Sikagard 850 Clear is a one-part ready to use, polyorganosiloxane based, permanent anti-graffiti and anti-fly poster semi-matt coating.

Uses:

As a permanent anti-graffiti and anti-fly poster coating on the following substrates:

• Fair faced concrete, masonry, cementitious render
• Coated concrete, masonry, cementitious render
• Coated concrete, masonry, cementitious render previously treated with a hydrophobic impregnation
• Coated or uncoated wood

Suitable for:

• Moisture control (Principle 2, method 2.3 of EN 1504-9)
• Increasing the resistivity (Principle 8, method 8.3 of EN 1504-9)

This product is part of the Sikagard Anti-graffiti System.

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• Features & Benefits
• System Information
• Application
• Limitations
• Drying Time
• Clean Up
• Maintenance
• Health And Safety

Features & Benefits

• Ready to use - no dilution with solvent at job site
• Permanent - graffiti can be typically removed more than 20 times without damaging the protection, or requiring a refresher coat, when using non-aggressive cleaning techniques
• Poster prevention – fly poster does not bond onto protected substrate or can be easily removed, even after many cleaning cycles
• Semi-matt aspect. Clear aspect when using the fairfaced concrete build-up
• No chemical agents required for cleaning
• Cleaning requires only cold-water pressure (80 to 100 bar) or cold-water low pressure washing and rubbing down with a clean cloth or scrubbing brush
• Water vapour permeable - Low water absorption
• Complies with the requirements of EN 1504-2 as protective coating
• Very good resistance against weathering and ageing - Good resistance to UV exposure
• Applied by brush, roller or airless spray
• Very low dirt pick-up
• Approvals/Standards include:
  • CE marking and Declaration of Performance (Ref. 31191591) based on EN 1504-2:2004 Products and systems for the protection and repair of concrete structures — Surface protection systems for concrete — Coating
  • Adhesion after thermal compatibility EN 13687- 1:2002 (100 cycles of freeze and thaw with de-icing salts) and EN 13687-2:2002 (10 cycles of thunder shower) - Applus Laboratories, Spain, Report Nber 21/32304762
  • Cleaning test as per SILKO procedure (v2:2019 § 4.2) and 20 cycles of cleaning - Applus Laboratories, Spain, Report Nber 21/32306190

System Information

System Structure

Please note: When applied to bare mineral surface, Sikagard 850 Clear may provide a wet look effect. To reduce/eliminate this effect, the following build-up is recommended:

Sikagard 552W Aquaprimer + Sikagard 850 Activator + Sikagard 850 Clear

Application

Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

IMPORTANT: Existing coatings must be tested to confirm their compatibility with Sikagard 850 Activator and Sikagard 850 Clear

Primer

Important notes:

• On rough substrates, use a brush to apply primer and make sure the primer covers all the surface including voids
• Allow the primer surface to dry and become tack-free before applying the top coat (~2–3 hours depending on weather conditions)
• Allow Sika MonoTop mortars to cure for 3–5 days before applying primer

Substrate (mineral) without existing coating or hydrophobic impregnation (including Sika MonoTop products):

• Apply Sikagard 850 Primer evenly over the prepared substrate at the required consumption rate (refer to Product Data Sheet)
• The primer must be continuous and pore free

Substrate (mineral or wood) with existing coating / lasure:

• Apply Sikagard 850 Activator evenly over the prepared substrate at the required consumption rate (refer to Product Data Sheet)
• The primer must be continuous and pore free

Substrate with hydrophobic impregnation:

• Apply Sikagard 850 Primer evenly over the prepared substrate at the required consumption rate (refer to Product Data Sheet)
• The primer must be continuous and pore free

Wood (Uncoated)

• No priming is required

Top Coat

Important notes:

• If applied over a primer or activator, refer to appropriate drying time / waiting time to overcoating

Application by brush or medium to long hair roller:

• If required, mix the coloured pigment into the product until fully dispersed and a uniform colour is achieved
• Apply the Product evenly over the surface
• The coating must be continuous, pore free and to the required surface finish
• Protect the freshly applied coating from heavy rain or rain showers until dry to prevent surface damage

Application by airless spray:

• Important -
  • Do not use aerosol car body type spraying equipment
    
  • Note: The airless spray may not give a smooth or acceptable finish
  • It may be necessary to back-roll the coating with a roller to ensure a suitable finish and film build-up

Requirement: Airless spraying characteristics:

• Pressure: 220 to 250 bars (3200 - 3600 psi)
• Hose: ~10 mm (3/8")
• Tip: 0.13° to 0.17°
• Filter: 60 mesh

• If required, mix the coloured pigment into the product until fully dispersed and a uniform colour is achieved
• Spray apply the Product in a continuous operation and at a speed to achieve a consistent thickness
• The coating must be continuous, pore free and to the required surface finish
• Protect the freshly applied coating from heavy rain or rain showers until dry to prevent surface damage

Limitations

• Sikagard 850 Clear is intended for the use in industrial and commercial applications where personal protective equipment is required and mandatory
• Do not use for aerosol-based applications. Sikagard®- 850 Clear applied using this application, disperses free aerosol vapour droplets in the air. Breathing in these droplets can cause extremely serious health risks to the user
• When the container is opened, any remaining product inside the container that has been exposed to the air, will continue to cure and thicken resulting in surface skinning and increased viscosity. It is therefore advised to use up all the product once it is opened until the container is empty
• The product can be used after a few days of opening the container, providing the skin layer is removed

Coverage

• Approximately 125 to 250g/m² for the top coat – generally 1 coat is sufficient on a suitably prepared, uniform and primed substrate

Drying Time

• Up to 24 hours at +20°C for thick film build-up
• Full cure in 7 days

Clean Up

• Clean all tools and application equipment with white spirit immediately after use.
• Hardened material can only be mechanically removed
• Clean airless spray equipment at regular intervals to prevent hardened silicon particles blocking the spraying tip

Maintenance

Graffiti Removal

IMPORTANT - Do not use rotating nozzle on high-pressure cleaning equipment.

As a general rule, always remove graffiti as soon as possible using either of the two options:

• Cold-water high-pressure jetting / cleaning equipment (~80 bar / 1200 psi) from a distance of ~10 cm from the substrate
• Cold-water low pressure washing and rubbing down with a suitable absorbent clean cloth or a soft scrubbing brush

Poster removal

• Posters applied with typical glues do not bond on substrates treated with Sikagard 850 Clear
• Either they will fall down under their own weight, or they can be easily removed with minimal effort

Health And Safety

For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Safety Data Sheet (SDS) containing physical, ecological, toxicological and other safety-related data.