MAPEI

Kerabond T / Keralastic System

Two-part tile mortar system · US · not yet reviewed

Check your container: This countdown is for the Two-part tile mortar system variant. Similar-looking versions may have different times.

How long before you can grout over MAPEI Kerabond T / Keralastic System?

Short answer

Ready for grout: 1–2 days after application.
Light foot traffic: 1–2 days after application.
Grout & tile mortar

Return-to-use gates

Open the surface gradually instead of treating cure as one moment

Touch / inspectA surface check only
Foot trafficUse the stated walking time
Heavy useWait for furniture, water or vehicle readiness

Calculate return-to-use time

When was the material placed?
Conditions that affect drying
Where?
Thickness

Stated times

  • Working time ends20–30 minutes
  • Ready for grout1–2 days
  • Light foot traffic1–2 days
  • Heavy traffic7 days
  • Immersion-ready21 days

From MAPEI data sheet · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.

Manufacturer website: mapei.com

Conditions & fine print
  • Stated conditions: 73°F (23°C) and 50% relative humidity
  • MAPEI says open time, pot life and time before grouting vary with jobsite conditions. Installation temperature must be between 40°F and 95°F. The values apply at 73°F (23°C) and 50% relative humidity.
  • Temperature range: 40°F to 95°F
  • Region US. Formulas can differ between countries; check your container.
  • Working time ends: 73°F (23°C), 50% RH
  • Ready for grout: 73°F (23°C), 50% RH; varies with jobsite conditions
  • Light foot traffic: 73°F (23°C), 50% RH
  • Heavy traffic: 73°F (23°C), 50% RH
  • Immersion-ready: 73°F (23°C), 50% RH
  • Entered from the manufacturer source; second review pending. Report outdated information
  • Actual results depend on preparation, thickness, ventilation, temperature, humidity, mixing and substrate.

Using this specific product

MAPEI Kerabond T / Keralastic System is listed here as the Two-part tile mortar system version for tile, floor, and pool. For grouting tile, the useful question is not simply whether the surface looks finished—it is whether the exact next-action milestone shown above has been reached.

Before you start

  • Confirm the package says Two-part tile mortar system; related versions can use different timing.
  • For tile, floor, and pool, pay particular attention to joint depth, water ratio, cleanup and room conditions.
  • 73°F (23°C), 50% RH. 73°F (23°C), 50% RH; varies with jobsite conditions.

How to check readiness

Inspect shaded joints and verify the stated water or traffic milestone. Open time is 20 to 30 minutes. Time before grouting: 24 to 48 hours. Try a protected edge first and avoid turning, dragging or concentrated loads.

Avoid this mistake

Color change alone does not prove the joint is ready for immersion.

Questions

How long before you can grout over this product?

MAPEI states: Open time is 20 to 30 minutes. Conditions: 73°F (23°C), 50% RH. Time before grouting: 24 to 48 hours. Conditions: 73°F (23°C), 50% RH; varies with jobsite conditions. Protect from traffic for 24 to 48 hours so that the mortar is sufficiently set. Conditions: 73°F (23°C), 50% RH. Protect from heavy traffic for 7 days. Conditions: 73°F (23°C), 50% RH. Protect from water immersion for 21 days. Conditions: 73°F (23°C), 50% RH. These are the manufacturer’s stated times, not a guarantee.

How long do I have to work with this product?

MAPEI states: Open time is 20 to 30 minutes. Conditions: 73°F (23°C), 50% RH. These are the manufacturer’s stated times, not a guarantee.

How long before I can walk on tile set with this product?

MAPEI states: Protect from traffic for 24 to 48 hours so that the mortar is sufficiently set. Conditions: 73°F (23°C), 50% RH. These are the manufacturer’s stated times, not a guarantee.

How long before heavy traffic is safe on this product?

MAPEI states: Protect from heavy traffic for 7 days. Conditions: 73°F (23°C), 50% RH. These are the manufacturer’s stated times, not a guarantee.

What affects how long this product takes to dry or cure?

MAPEI says open time, pot life and time before grouting vary with jobsite conditions. Installation temperature must be between 40°F and 95°F. The values apply at 73°F (23°C) and 50% relative humidity. Follow the product label for your conditions.

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