Sikagard® H 400

Sikagard® H 400 is a water-based alkylalkoxysilane sealer.

40%

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.

7.9 lbs/gal

Specific gravity

0.95 at 77 °F (25 °C)

40%

0.24 in (6.1 mm), average depth depending upon substrate

Water weight gain

Test results are averages obtained at a coverage rate of 125 ft²/gal (3.12 m²/3.8 L) under laboratory conditions.
Reasonable variations can be expected.

Concrete:

• 100–200 ft²/gal (2.4–4.8 m²/L

Brick:

• 100–200 ft²/gal (2.4–4.8 m²/L)

Always apply a test area to determine actual coverage rates. Coverage rates will vary greatly with the porosity of the substrate.

For Best Performance

• Keep material from freezing.
• Do not dilute Sikagard® H 400.
• Water repellents perform best when applied to a dry substrate, when power washing is performed, allow for a proper dry time before applying the water repellent.
• Do not apply during inclement weather or when inclement weather is anticipated within 12 hours.
• To prevent damage to nearby shrubbery and landscaping, cover or protect with drop cloth.
• Protect asphalt-based products such as roofing materials or plastic products from overspray.
• Sikagard® H 400 may leave a temporary slippery surface for up to several hours after application. Therefore, traffic-bearing surfaces should not be reopened until the treated surface is dry.
• Variations in the texture and porosity of the substrate will affect the coverage and performance of the product.
• Sikagard® H 400 will not inhibit water penetration through unsound or cracked surfaces or surfaces with defective flashing, caulking, or structural waterproofing.
• Line striping can be done after the application of the sealer.
• 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 are not for supervising or providing quality control on the jobsite.

1. Verify substrate has properly cured. Concrete should obtain 80% of design strength, typically achieved within 14–28 days.
2. Clean concrete surfaces of all sand, surface dust and dirt, oil, grease, chemical films, coatings, and other contaminants prior to application. Power wash, sandblast, or shotblast as necessary to achieve the desired surface condition.
3. Surface, air, and material temperatures should be 40 to 110 °F (4 to 43 °C) during application. Do not apply Sikagard® H 400 when temperatures are expected to fall below 40 °F (4 °C) within 12 hours.
4. A dry surface is suggested for maximum penetration of sealer; however, surfaces to be treated can be slightly damp.,. Do not apply Sikagard® H 400 if standing water is visible on the surface to be treated.
5. Crack control, caulking, patching, and expansion joint sealants can be installed before or after the application of the sealer. Allow a minimum of 6–12 hours of curing time for caulking and sealant materials (or until they have skinned over) before applying Sikagard® H 400. Following the application, remove the excess product that might pond on a concave sealant joint.

1. Test a small area of the surface (generally a 5 by 5 ft [1.5 by 1.5 m] section) before starting the general application of any clear penetrating sealer to ensure desired performance results, aesthetics, and coverage rates. Allow 5–7 days for the product to fully react before evaluation.
2. Stir material thoroughly before and during application.
3. Apply to saturation. Apply by low-pressure non-atomizing spray or, if desired on horizontal surfaces, by pouring, followed by a squeegee or a broom for even distribution.

Clean equipment and tools with hot soapy water. Overspray can be cleaned immediately with hot soapy water. Dried residue can be cleaned with a mild citrus-based cleaner or very hot water, then scrubbed with a soft-bristle brush.