Red Devil

FIRESTOP-814+

Intumescent sealant (LC150RD) · US · manufacturer-sourced

Check your container: This countdown is for the Intumescent sealant (LC150RD) variant. Similar-looking versions may have different times.

How long does Red Devil FIRESTOP-814+ take to cure?

Short answer

Full cure: 14–28 days after application.
Firestop sealants

Firestop cure plan

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

  1. Install the Intumescent sealant (LC150RD) 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

  • Full cure2–4 weeks

Worth noticing: The manufacturer states only one timing here (full cure, 2–4 weeks); nothing else is inferred.

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 Intumescent sealant (LC150RD) 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

  • Full cure14–28 days

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

Manufacturer website: reddevil.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 120°F
  • Region US. Formulas can differ between countries; check your container.
  • Full cure: The sheet's rate is about 1/8 inch (3 mm) per day.
  • 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 Report outdated information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
Red Devil FIRESTOP-814+
Variant
Intumescent sealant (LC150RD)
Region
US
Listed use
through-penetration firestop, joints
Timed stages recorded
full cure
Source checked
2026-10-25

Documentation: Technical data sheet · Technical data sheet (undated)

Condition attached to the stated time: The sheet's rate is about 1/8 inch (3 mm) per day.

About this product

An intumescent sealant whose sheet is blunt: 3 to 4 weeks to full cure, at a depth rate of about 1/8 inch a day. Paint only after full cure, with a non-solvent paint.

Using this specific product

Red Devil FIRESTOP-814+ is listed here as the Intumescent sealant (LC150RD) version for through-penetration firestop and joints. 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 Intumescent sealant (LC150RD); related versions can use different timing.
  • For through-penetration firestop and joints, pay particular attention to temperature, joint depth, humidity and the thickness of the bead.
  • The sheet's rate is about 1/8 inch (3 mm) per day.

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. 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 cure?

Red Devil states: The sheet gives full cure of 3 to 4 weeks. Conditions: The sheet's rate is about 1/8 inch (3 mm) per day.. These are the manufacturer’s stated times, not a guarantee.

Can I paint FIRESTOP-814+ right away?

No. The sheet says to paint only after full cure, with non-solvent paint.

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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