Sikaflex 2CSL Limestone is a 2-component, premium-grade, polyurethane-based, elastomeric sealant. It is principally a chemical cure in a self-leveling consistency.
Joint wall surfaces must be clean, sound, and frost-free. Joint walls must be free of oils, grease, curing compound residues, and any other foreign matter that might prevent bond. Ideally this should be accomplished by mechanical means. A roughened surface will also enhance bond. Bond breaker tape or backer rod must be used in bottom of joint to prevent bond.
Priming is typically not necessary. Most substrates only require priming if sealant will be subjected to water immersion after cure. Testing should be done, however, on questionable substrates, to determine if priming is
needed. Consult Technical Service or Sikaflex Primer Product Data Sheet for additional information on priming.
Pour entire contents of Component ‘B’ into pail of Component ‘A’ and mix with a low-speed drill (400–600 rpm) and Sikaflex paddle. * Mix for 3–5 minutes to achieve a uniform color and consistency. Scrape down sides of pail periodically. Avoid entrapment of air during mixing. Note: *For pre-pigmented Limestone base, just mix with low speed drill and Sikaflex paddle (no Color-pack needed)
Recommended application temperatures 40–100 °F. Preconditioning units to 65–75 °F is necessary when working at extremes. Move pre-conditioned units to work areas just prior to application. Apply sealant only to clean, sound, dry, and frost-free substrates. Sikaflex 2CSL Limestone should be applied into joints when joint slot is at midpoint of its designed expansion and contraction. To place, pour or extrude the SL grade in one direction and allow it to flow and level as necessary. If extruding, load mixed sealant directly into bulk gun or use follower plate loading system. Place nozzle of gun into bottom of joint and fill entire joint. Keeping the nozzle deep in the sealant, continue with a steady flow of sealant preceding nozzle to avoid air entrapment. Also, avoid overlapping
of sealant since this also entraps air.
Uncured material can be removed with an approved solvent. Strictly follow solvent manufacturer’s warnings and instructions for use. Cured material can only be removed mechanically. For spillage, collect, absorb, and dispose of in accordance with current, applicable local, state, and federal regulations.