TEC (H.B. Fuller)

PermaLastic 200 Polymer Modified Thin Set Mortar (426/427)

Powder · US · manufacturer-sourced

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

How long before you can grout over TEC (H.B. Fuller) PermaLastic 200 Polymer Modified Thin Set Mortar (426/427)?

Short answer

Ready for grout: 16 hours to 1 day after application.
Full cure: 21 days after application.
Grout & tile mortar

Grout wait-and-wash

Wipe-off, light foot traffic and sealing each have their own wait

  1. Pack the joints with Powder
  2. Wipe off inside the stated window
  3. Seal and use only after the stated cure

This product’s stated stages

  • Working time ends2–3 hours
  • Ready for grout16 hours to 1 day
  • Full cure3 weeks

Worth noticing: Working time is only 2–3 hours; the next stated stage, ready for grout, is 16 hours to 1 day.

Common mistake: Sealing or soaking a grout joint that has set but not fully dried.

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

Time the grout cure

When was the grout applied?
Conditions that affect drying
Where?
Thickness

Stated times

  • Working time ends2–3 hours
  • Ready for grout16 hours to 1 day
  • Full cure21 days

From TEC (H.B. Fuller) data sheet · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.

Manufacturer website: tecspecialty.com

Conditions & fine print
  • Stated conditions: Not stated in the data sheet
  • Times depend on temperature, humidity, substrate and tile type. Follow the current data sheet for your exact setting bed and application. The data sheet gives an open time of more than 20 minutes and says to keep traffic off before grouting.
  • Temperature range: 50°F to 90°F
  • Region US. Formulas can differ between countries; check your container.
  • Working time ends: The source gives no conditions for this time.
  • Ready for grout: The source gives no conditions for this time.
  • Full cure: The source gives no conditions for this time.
  • Entered from the cited manufacturer documentation. Check the current label for the exact formula and region. Report outdated information
  • Actual results depend on preparation, thickness, ventilation, temperature, humidity, mixing and substrate.

Confirm this is your product

Closely named formulas, colors and regional versions can use different times. Match these details to your container before starting a countdown.

Exact listing
TEC (H.B. Fuller) PermaLastic 200 Polymer Modified Thin Set Mortar (426/427)
Variant
Powder
Region
US
Listed use
thin set, tile mortar
Timed stages recorded
tooling, grout ready, full cure
Source checked
2026-10-25

Documentation: Technical data sheet · DS426/427_R1225-20

Condition attached to the stated time: The source gives no conditions for this time.

About this product

PermaLastic 200 Polymer Modified Thin Set Mortar (426/427) is a grout & tile mortar product from TEC (H.B. Fuller), listed for thin set, tile mortar. Its times are stated under: The source gives no conditions for this time. This page tracks 3 stated steps, from working time at 2 hours to full cure at 21 days.

Using this specific product

TEC (H.B. Fuller) PermaLastic 200 Polymer Modified Thin Set Mortar (426/427) is listed here as the Powder version for thin set and tile mortar. 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 Powder; related versions can use different timing.
  • For thin set and tile mortar, pay particular attention to joint depth, water ratio, cleanup and room conditions.
  • The source gives no conditions for this time.

How to check readiness

Inspect shaded joints and verify the stated water or traffic milestone. The data sheet gives a pot life of 2 to 3 hours. The data sheet gives 16 to 24 hours before grouting. Reserve full cure for demanding use, chemicals, washing, immersion or load—not merely gentle handling.

Avoid this mistake

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

Compare with similar products

Keep going

Questions

How long before you can grout over this product?

TEC (H.B. Fuller) states: The data sheet gives a pot life of 2 to 3 hours. Conditions: The source gives no conditions for this time.. The data sheet gives 16 to 24 hours before grouting. Conditions: The source gives no conditions for this time.. The data sheet gives 21 days for full cure. Conditions: The source gives no conditions for this time.. These are the manufacturer’s stated times, not a guarantee.

How does PermaLastic 200 Polymer Modified Thin Set Mortar (426/427) compare with other grout & tile mortar products?

TEC (H.B. Fuller) states 16 hours for grout, right at the median of 16 hours across 17 grout & tile mortar products here. The quickest listed is Custom Building Products Aqua Mix Pro-Solv Sealer at 2 hours; the slowest is MAPEI Kerabond T / Keralastic System at 1 day.

Why does PermaLastic 200 Polymer Modified Thin Set Mortar (426/427) show a range for working time?

The source gives 2–3 hours for working time. This site counts down to the earliest stated time (2 hours) and keeps the range visible so you can judge the rest from your conditions.

What conditions do the stated times for PermaLastic 200 Polymer Modified Thin Set Mortar (426/427) assume?

Stated conditions: The source gives no conditions for this time. Application temperature: 50 to 90°F. Cooler, damper or thicker applications usually take longer.

How long does this product take to fully cure?

TEC (H.B. Fuller) states: The data sheet gives 21 days for full cure. Conditions: The source gives no conditions for this time.. These are the manufacturer’s stated times, not a guarantee.

How long do I have to work with this product?

TEC (H.B. Fuller) states: The data sheet gives a pot life of 2 to 3 hours. Conditions: The source gives no conditions for this time.. These are the manufacturer’s stated times, not a guarantee.

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

Times depend on temperature, humidity, substrate and tile type. Follow the current data sheet for your exact setting bed and application. The data sheet gives an open time of more than 20 minutes and says to keep traffic off before grouting. Follow the product label for your conditions.

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