Sika Thorolastic®-850

Silicone-modified 100% acrylic emulsion coating

18 months when properly stored

Store in unopened containers in a clean, dry area. Keep from freezing.

10.6 lbs/gal (88.3 kg/L)

55.1%

45.7%

131 KU

Hiding at 6 wet mils (0.15 mm)

Algae resistance

Dirt pick-up

Times assume 70 °F (21 °C) and 50% relative humidity.
To recoat: minimum of 12 hours.

• Do not apply when the substrate or ambient temperature is 40 °F (4 °C) or below or is expected to fall below 40 °F (4 °C) within 24 hours after application.
• Do not apply if rain is expected within 24 hours of application.
• Do not use on interior applications, undersides of balconies, soffits, below-grade applications, or for immersion service.
• Do not use where there may be hydrostatic water transfer from the backside of the substrate.
• Do not apply to improperly sealed substrates that are subject to rising dampness or migrating moisture.
• Not intended for use as a horizontal traffic-bearing coating.
• The application of nonelastomeric topcoats could reduce the performance properties of Sika Thorolastic®-850.
• Apply a 4 by 4 ft (1.2 by 1.2 m) test area to verify acceptable color and adhesion before proceeding with any project. The test method for measuring adhesion is ASTM D 3359, Measuring Adhesion by Tape Method A. On the 0–5 scale, a minimum adhesion rating of 4A is required.
• Color formulas containing organic colorants are susceptible to fading in exterior applications. Refer to Technical Support for guidance.
• Do not thin the material.
• For professional use only; not for sale to or use by the general public.
• Make certain the most current versions of the product data sheet and SDS are being used.
• Proper application is the responsibility of the user. Field visits by Sika personnel are for the purpose of making technical recommendations only and not for supervising or providing quality control on the jobsite.

1. Surfaces should be clean and sound and free of all bond-inhibiting contaminants.
2. Concrete substrates should be fully cured.
3. Repair any holes, spalled, and damaged concrete with appropriate Sika repair materials. Allow appropriate cure time prior to coating.
4. Remove any protruding concrete accessories and smooth out any surface irregularities.
5. High-pressure power wash surface (or abrasive blast on hard, dense surfaces) to create a profile of SP 3, per ICRI Guide 310.2.
6. Some stains may require chemical removal. Neutralize any cleaning compounds used and rinse with clean water.
7. Check the adhesion of old coatings according to ASTM D 3359, Measuring Adhesion by Tape Test Method A.
8. Remove any blisters or delaminated areas and sand edges to smooth rough areas and provide transition to old paint areas.
9. Treat cracks greater than 1⁄32" with Sika Thorocoat®-746 Knife Grade or SikaWall® FL 748. Treat cracks larger than ¼" as expansion joints and fill with appropriate Sika sealant.
10. New CMU must have a base coat of Sika Thorocoat®-749 Block Filler.

1. Prior to use, mix Sika Thorolastic®-850 at a slow speed with a drill and mixing paddle to ensure uniform color disbursement and to minimize air entrapment.
2. In multi-pail applications, mix the contents of each new pail into the partially used previous pail to ensure color consistency and smooth transitions from pail to pail.

1. Apply Sika Thorolastic®-850 by brush, spray, roller, or spray-and-backroll. Sika Thorolastic®-850 can be applied in a one or two-coat application, achieving a total dry-film thickness (DFT) of 12–18 MILS.
2. Maintain proper uniform wet-film thickness (WFT) during application to ensure the performance characteristics desired (see yield rates section).
3. Always work to a natural break and maintain a wet edge during application.
4. For uniformity of color, application techniques must be consistent throughout the project.

Roller

1. Use a quality ¾–1¼" nap roller cover.
2. Completely saturate the roller and keep it loaded with the coating to build the required mils. Never dry roll.
3. Cross roll, maintaining a wet edge, to achieve uniform thickness. Backroll in one direction for a consistent appearance.

Spray

1. Equipment is available for spraying Sika Thorolastic®-850. Contact the equipment manufacturer for further recommendations.
2. Backrolling in one direction after spray application is recommended to achieve uniform film thickness.

Brush

1. Application by brush is recommended only for small inaccessible areas, e.g., on touch-ups.
2. Use only a nylon brush.

Clean all tools and equipment immediately with water. Cured material may be removed by mechanical means.