Sikafloor®-1620 is a high-solids, low-viscosity, moisture-tolerant epoxy primer used as a moisture vapor control layer on concrete substrates. It is designed to significantly reduce moisture vapor transmission and is suitable for use beneath Sikafloor®, Sikagard®, and Sikalastic® resin flooring systems.

• Primer: Sikafloor®-1620 (applied as a neat coat with no aggregate broadcast)
• Moisture Barrier (if needed): Sikafloor®-81 EpoCem®CA (used when substrate moisture exceeds 6%)
• Topcoat Options: Any Sikafloor®, Sikagard®, or Sikalastic® resin systems as specified

• Suitable for use in interior environments on high-moisture concrete substrates
• Used under resin flooring systems to meet ASTM F3010 moisture mitigation standards
• Approved for use in food processing facilities (CFIA and USDA compliant)

• Mix Ratio: A:B = 3:1 by volume
• Coverage: ~106 ft²/US gal at 15 mils wet film thickness
• Installation Temperature: 10–30 °C (50–86 °F)
• Humidity Limit: Max 85% RH during application and cure
• Substrate Moisture Limit: ≤ 6% by weight (Tramex® CM/E meter)
• If >6% Moisture: Use Sikafloor®-81 EpoCem®CA then coat with Sikafloor®-1620
• Pot Life: ~38 minutes at 20 °C (68 °F)
• Cure Time:
• Foot traffic: 8–36 hours depending on temperature
• Full cure: 4–10 days
• Overcoating Window:
• At 20 °C (68 °F): 8 to 48 hours
• Surface must be sanded if max recoat time exceeded

• Sikafloor®-1620 is not UV stable and will discolor over time if exposed; it must be overcoated.
• Not suitable for exterior slabs exposed to freeze-thaw cycles or extreme thermal shock.
• Not a finish coat—only a primer for moisture control.
• Do not apply to polymer-modified cement mortars or ASR-affected substrates.
• Avoid air flow disturbances and contamination during cure.
• Must be mechanically mixed—do not hand mix or thin.