RectorSeal

Metacaulk 150+

Firestopping sealant, gun or trowel applied · US · manufacturer-sourced

Check your container: This countdown is for the Firestopping sealant, gun or trowel applied variant. Similar-looking versions may have different times.

How long does RectorSeal Metacaulk 150+ take to dry?

Short answer

Tack-free: 30 minutes after application.
Full cure: 21–28 days after application.
Firestop sealants

Firestop cure plan

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

  1. Install the Firestopping sealant, gun or trowel applied 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 77°F

  • Tack-free30 minutes
  • Full cure3–4 weeks

Worth noticing: Tack-free at 30 minutes; full cure at 3–4 weeks.

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 Firestopping sealant, gun or trowel applied 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-free30 minutes
  • Full cure21–28 days

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

Manufacturer website: rectorseal.com

Conditions & fine print
  • Stated conditions: 77°F (25°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 120°F
  • Region US. Formulas can differ between countries; check your container.
  • Tack-free: At 77°F (25°C).
  • Full cure: At 77°F (25°C).
  • 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 Report outdated information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
RectorSeal Metacaulk 150+
Variant
Firestopping sealant, gun or trowel applied
Region
US
Listed use
firestop sealing, wall penetrations
Timed stages recorded
tack free, full cure
Source checked
2026-10-25

Documentation: Technical data sheet copy · Product data, code R50341-2604

Condition attached to the stated time: At 77°F (25°C).

About this product

A firestopping sealant that can be gunned or troweled flush with the wall. It skins over in 30 minutes but the sheet lists a 3 to 4 week cure at 77°F, one of the longest on the site for a sealant that is touchable the same day.

Using this specific product

RectorSeal Metacaulk 150+ is listed here as the Firestopping sealant, gun or trowel applied version for firestop sealing and wall penetrations. 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 Firestopping sealant, gun or trowel applied; related versions can use different timing.
  • For firestop sealing and wall penetrations, pay particular attention to temperature, joint depth, humidity and the thickness of the bead.
  • At 77°F (25°C).

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 data sheet lists a skin-over time of 30 minutes. 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?

RectorSeal states: The data sheet lists a skin-over time of 30 minutes. Conditions: At 77°F (25°C).. The data sheet lists a cure time of 3 to 4 weeks. Conditions: At 77°F (25°C).. These are the manufacturer’s stated times, not a guarantee.

Why does Metacaulk 150+ take 3 to 4 weeks to cure?

The sheet lists a cure time of 3 to 4 weeks at 77°F (25°C) and a skin-over time of 30 minutes. The skin is only the surface, and the sheet does not give a rate per day.

How long does this product take to fully cure?

RectorSeal states: The data sheet lists a cure time of 3 to 4 weeks. Conditions: At 77°F (25°C).. 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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