Schluter Systems

ALL-SET Modified Thin-Set Mortar

Gray / white · US · not yet reviewed

Check your container: This countdown is for the Gray / white variant. Similar-looking versions may have different times.

How long before you can grout over Schluter Systems ALL-SET Modified Thin-Set Mortar?

Short answer

Ready for grout: 12 hours after application.
Heavy traffic: 1 day 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 grout12 hours
  • Heavy traffic1 day

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

Manufacturer website: schluter.com

Conditions & fine print
  • Stated conditions: 70°F (21°C)
  • Protect the installation from freezing for a minimum of 28 days. The data sheet is dated 2017; check schluter.com for the current revision.
  • Region US. Formulas can differ between countries; check your container.
  • Working time ends: At 70°F (21°C); varies with jobsite conditions. Pot life is 2 to 4 hours.
  • Ready for grout: At 70°F (21°C). Colder temperatures may require extended cure times before and after grouting.
  • Heavy traffic: At 70°F (21°C). Protect the installation for a minimum of 24 hours to allow the mortar to set.
  • 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 Report outdated information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

Schluter Systems ALL-SET Modified Thin-Set Mortar is listed here as the Gray / white version for tile, thin-set, and floor. 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 Gray / white; related versions can use different timing.
  • For tile, thin-set, and floor, pay particular attention to joint depth, water ratio, cleanup and room conditions.
  • At 70°F (21°C); varies with jobsite conditions. Pot life is 2 to 4 hours. At 70°F (21°C). Colder temperatures may require extended cure times before and after grouting. At 70°F (21°C). Protect the installation for a minimum of 24 hours to allow the mortar to set.

How to check readiness

Inspect shaded joints and verify the stated water or traffic milestone. Open time is 20 to 30 minutes. Wait at least 12 hours before grouting. Open the area gradually and keep heavy or hot tires off until the full stated milestone.

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?

Schluter Systems states: Open time is 20 to 30 minutes. Conditions: At 70°F (21°C); varies with jobsite conditions. Pot life is 2 to 4 hours.. Wait at least 12 hours before grouting. Conditions: At 70°F (21°C). Colder temperatures may require extended cure times before and after grouting.. Time to heavy traffic is 24 hours. Conditions: At 70°F (21°C). Protect the installation for a minimum of 24 hours to allow the mortar to set.. These are the manufacturer’s stated times, not a guarantee.

How long do I have to work with this product?

Schluter Systems states: Open time is 20 to 30 minutes. Conditions: At 70°F (21°C); varies with jobsite conditions. Pot life is 2 to 4 hours.. These are the manufacturer’s stated times, not a guarantee.

How long before heavy traffic is safe on this product?

Schluter Systems states: Time to heavy traffic is 24 hours. Conditions: At 70°F (21°C). Protect the installation for a minimum of 24 hours to allow the mortar to set.. These are the manufacturer’s stated times, not a guarantee.

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

Protect the installation from freezing for a minimum of 28 days. The data sheet is dated 2017; check schluter.com for the current revision. Follow the product label for your conditions.

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