Sika Thorocoat®-749 Block Filler

Sika Thorocoat®-749 Block Filler contains solvent, acrylic copolymer, fillers, and other proprietary ingredients.

18 months when properly stored

Store in unopened containers in a clean, dry area between 35 °F and 110 °F (2 °C and 43 °C). Keep from freezing.

• Times assume 70 °F (21 °C) and 50% relative humidity.
• Dry-to-touch: 4-6 hours
• Recoat time: 12 hours minimum
• Lower surface or air temperatures and higher relative humidity will extend the drying time.
• If the top coating is delayed, ensure that Sika Thorocoat®-749 Block Filler is clean and free of dust, other contaminants, and stains when work resumes.

35-100 ft²/gal (0.86-2.45 m²/L) Coverage will vary depending on surface texture and porosity.

• Not intended for use as a finish coat.
• Do not apply when the temperature (substrate, or ambient) 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.
• Do not thin.
• Avoid application to uncapped or unsealed walls subject to heavy rains.
• Do not apply over moving cracks, control joints, or expansion joints.
• 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; call Customer Service (1-800-433-9517) to verify the most current version.
• 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, sound, and free of all bond-inhibiting contaminants.
2. Concrete substrates should be fully cured.
3. Point or seal all cracks and voids.

Prior to use, mix at a slow speed with a drill and mixing paddle to ensure uniform distribution of contents and to minimize air entrapment.

1. Sika Thorocoat®-749 Block Filler can be brushed, rolled, or spray applied followed by back brushing or back rolling. Back brushing or backrolling is mandatory on porous, textured substrates such as fluted, splitfaced, and lightweight block.
2. Sika Thorocoat®-749 Block Filler can be applied to a dry or slightly dampened (non-saturated) substrate.
3. Hot substrates may require dampening to cool the surface and prevent flash drying.

Roller Application

1. Use a 1-1/2” (38 mm) nap roller.
2. Keep the roller fully loaded with material.
3. Work material uniformly onto the wall, always maintaining a wet edge.
4. Apply sufficient material to completely fill all pores, leveling the material to provide uniform texture and film thickness.
5. The objective is to obtain a pinhole-free, consistent film on all treated surfaces.

Spray Application

1. Sika Thorocoat®-749 Block Filler can be applied by heavy-duty airless or air-assisted texture spray equipment. Contact the equipment manufacturer for further recommendations.
2. Immediately backroll or back-brush spray applications to fill in the pores and finish the material in a uniform manner.

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