Sikagard 850 Primer is a primer for the Sikagard 850 Anti-Graffiti Coating System on uncoated mineral substrates.

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

Features & Benefits

• Primer for the Sikagard 850 Anti-Graffiti Coating System on uncoated mineral substrates
• Low viscosity
• Ready to use - no on-site dilution required
• Adhesion promoting primer
• Specifically used with Sikagard 850 Clear
• Applied by brush, roller or airless spray
• 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

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.

Primer

Important notes:

• On rough substrates, use a brush to apply primer and make sure the primer covers all the surface including voids
• Note: To prevent air bubbles affecting the finish, do not 'over' brush or roll it

Method:

• 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
• Apply Sikagard 850 Primer evenly over the prepared coating with a brush or long hair roller at the required consumption rate
• It is also possible to apply 850 Primer by Airless Spray but brush application is recommended to ensure the material is well applied and pushed into all pores etc.

Limitations

• Do not use for aerosol-based applications. Sikagard 850 Primer 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 75 to 125g/m² for the top coat

Drying Time

• Typically 2 to 3 hours depending on weather conditions
• Wait until the surface is tack free before overcoating

Clean Up

• Clean all tools and application equipment with white spirit immediately after use.
• Hardened material can only be mechanically removed

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.