Tarlton

FS-ONE Intumescent Firestop Sealant

Single-component intumescent sealant · US · manufacturer-sourced

Check your container: This countdown is for the Single-component intumescent sealant variant. Similar-looking versions may have different times.

How long does Tarlton FS-ONE Intumescent Firestop Sealant take to dry?

Short answer

Tack-free: 20–30 minutes after application.
Full cure: 3 days after application.
Firestop sealants

Firestop cure plan

A skin is not a cure, and depth sets the pace

  1. Install the Single-component intumescent sealant to the tested system
  2. Leave it undisturbed through the skin stage
  3. Wait for full cure before painting or inspection

This product’s stated stages Quoted at 73°F

  • Tack-free20–30 minutes
  • Curing period2 days
  • Full cure3 days

Worth noticing: Tack-free at 20–30 minutes; full cure at 3 days.

Common mistake: Painting or covering a firestop that has skinned but not cured through.

Firestop sealants

Bond-strength path

Assembly, handling and full load are different stages

1 · AssembleClean, fit and apply the Single-component intumescent sealant version correctly.
2 · HoldKeep the joint undisturbed through its set or clamp stage.
3 · LoadUse full cure—not surface firmness—before demanding use.

Time the firestop cure

When was the sealant installed?
Conditions that affect drying
Where?
Thickness

Stated times

  • Tack-free20–30 minutes
  • Curing period complete2 days
  • Full cure3 days

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

Manufacturer website: tarltoncorp.com

Conditions & fine print
  • Stated conditions: 73°F (23°C)
  • Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet.
  • Temperature range: 40°F to 104°F
  • Region US. Formulas can differ between countries; check your container.
  • Tack-free: At 73°F and 50% humidity.
  • Curing period complete: Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet.
  • Full cure: Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet.
  • 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 Report outdated information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
Tarlton FS-ONE Intumescent Firestop Sealant
Variant
Single-component intumescent sealant
Region
US
Listed use
through-penetration firestop, joint firestop
Timed stages recorded
tack free, cure period, full cure
Source checked
2026-10-25

Documentation: Technical data sheet · Technical data sheet, MSDS 259 rev 010 (08/17/04)

Condition attached to the stated time: At 73°F and 50% humidity.

About this product

An intumescent sealant whose cure is quoted at a depth: three days for 2 mm, which tells you a deep bead takes much longer.

Using this specific product

Tarlton FS-ONE Intumescent Firestop Sealant is listed here as the Single-component intumescent sealant version for through-penetration firestop and joint firestop. For sealing a firestop opening, 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 Single-component intumescent sealant; related versions can use different timing.
  • For through-penetration firestop and joint firestop, pay particular attention to temperature, joint depth, humidity and the thickness of the bead.
  • At 73°F and 50% humidity. Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet.

How to check readiness

Confirm the sealant is tack-free and cured to depth before the opening is inspected or the area is closed up. The sheet gives skin-over in 20 to 30 minutes. The sheet says to leave the sealant undisturbed for 48 hours. Reserve full cure for demanding use, chemicals, washing, immersion or load—not merely gentle handling.

Avoid this mistake

Tack-free is only the surface; the rated seal depends on the full depth cure shown on the sheet.

Compare with similar products

Keep going

Questions

How long does this product take to dry?

Tarlton states: The sheet gives skin-over in 20 to 30 minutes. Conditions: At 73°F and 50% humidity.. The sheet says to leave the sealant undisturbed for 48 hours. Conditions: Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet.. The sheet gives cure in 3 days at a 2 mm (1/16 in) depth. Conditions: Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet.. These are the manufacturer’s stated times, not a guarantee.

How long does FS-ONE take to cure?

The sheet gives 3 days at 2 mm depth, with the work left undisturbed for 48 hours.

How long does this product take to fully cure?

Tarlton states: The sheet gives cure in 3 days at a 2 mm (1/16 in) depth. Conditions: Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet.. These are the manufacturer’s stated times, not a guarantee.

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

Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet. Follow the product label for your conditions.

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