Sikagard®-250 KNS

• Sikagard®-250 KNS is recommended for use on Class 1, 2, 3, and 4 concrete floors as classified in Table 1.1, ACI Standard 302
• ASTM C 309, Type 1, Class A
• ASTM C 1315, Type I, Class A
• Corps of Engineers CRD-C304,
• Type I, Class A or B AASHTO M-148
• USDA compliant for use in meat and poultry areas, when fully cured

Sikagard®-250 KNS is an acrylic polymer resin in a solvent carrier.

18 months when properly stored

Store in unopened containers in a clean, dry area between 35° and 85° F (2° and 29° C). Keep from freezing.

Adhesion of Tile Cement

applied at 300 ft²/gal

• Times are based upon temperatures 65 to 85° F (18 to 29° C) at 50% relative humidity.
• Light foot traffic or between coats: 3 hours
• Normal traffic: overnight
• Maximum hardness : 7 days
• Material will take longer to dry at either higher humidity or lower temperatures

Curing only: 200–400 ft²/gallon (4.9–9.8 m²/L)
Second coat (dustproofing and sealing): 400–600 ft²/gallon (9.8–14.7 m²/L)
Recoating, dustproofing and sealing: 200–300 ft²/gallon (4.9–7.4 m^2/L)

Coverage varies with application method, texture and porosity of surface.

1. Freshly placed concrete must be properly finished. The surface is application-ready when it is damp, but not wet, and when it cannot be marred by foot traffic.
2. Existing concrete surfaces should be thoroughly repaired and cleaned before application. The surface must be clean, dry, and free of dust, oil, grease, sealers, and all other surface contaminants that might inhibit the proper bond of material.

1. Thoroughly mix the material in the original container before applying.
2. Apply a continuous, uniform film by solvent-resistant, low-pressure spray only, short-nap roller, or lamb’s wool applicator.
3. For curing, one coat may be sufficient. However, two coats may be required in hot and windy conditions. Apply evenly and uniformly as soon as possible after final finishing.
4. To seal and dustproof, two coats are required. Apply the second coat when all trades have completed their work and the site is ready for occupancy.
5. Do not overapply or soak concrete surfaces with the curing compound. Do not allow the curing compound to pool on the surface.
6. Over-application can result in alligatoring and mud cracking, whereby a film forms on the substrate before the material dries properly. Over-application may also cause opacity, as elements of the curing compound become trapped in the subsurface and cannot escape.

Clean tools and equipment withSikaSwell®-990 immediately after use and while Sikagard®-250 KNS is still wet.