Permatex

Permatex High Temperature Thread Sealant

Pipe thread sealant, 400°F · US · manufacturer-sourced

Check your container: This countdown is for the Pipe thread sealant, 400°F variant. Similar-looking versions may have different times.

How long does Permatex High Temperature Thread Sealant take to cure?

Short answer

Full cure: 1 day after application.
Can take load or strain: 3 days after application.
Gasket makers

Gasket-sealing stages

Assemble, wait, then fill and pressurize

  1. Apply the Pipe thread sealant, 400°F to clean, dry flanges
  2. Assemble within the stated time
  3. Fill and run only after the stated cure

This product’s stated stages Quoted at 73°F

  • Full cure1 day
  • Ready for load3 days

Worth noticing: Full cure at 1 day; ready for load at 3 days.

Common mistake: Adding fluid or pressure before the gasket has cured; leaks follow.

Gasket makers

Bond-strength path

Assembly, handling and full load are different stages

1 · AssembleClean, fit and apply the Pipe thread sealant, 400°F 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 gasket cure

When did you assemble the joint?
Conditions that affect drying
Where?
Thickness

Stated times

  • Can take load or strain3 days
  • Full cure1 day

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

Manufacturer website: permatex.com

Conditions & fine print
  • Stated conditions: 73°F (23°C)
  • Do not pressurize beyond what the data sheet allows before the stated cure.
  • Region US. Formulas can differ between countries; check your container.
  • Can take load or strain: The source gives no conditions for this time.
  • Full cure: At 72°F (22°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 Report outdated information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
Permatex Permatex High Temperature Thread Sealant
Variant
Pipe thread sealant, 400°F
Region
US
Listed use
pipe threads, exhaust and heat fittings, plumbing
Timed stages recorded
load ready, full cure
Source checked
2026-10-25

Documentation: Technical data sheet copy · Data sheet rev. 03/03

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

About this product

The 400°F thread sealant. The sheet gives immediate low-pressure sealing, a 24 hour cure and a 72 hour wait before the joint is sealed to pipe burst pressure. Parts can be repositioned for up to 24 hours.

Using this specific product

Permatex Permatex High Temperature Thread Sealant is listed here as the Pipe thread sealant, 400°F version for pipe threads, exhaust and heat fittings, and plumbing. For using this product, 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 Pipe thread sealant, 400°F; related versions can use different timing.
  • For pipe threads, exhaust and heat fittings, and plumbing, pay particular attention to the exact variant, preparation and environmental conditions.
  • The source gives no conditions for this time. At 72°F (22°C).

How to check readiness

Check the real material or treated area at the slowest location before the next step. The data sheet says that after 72 hours the joint is sealed to pipe burst pressure. Reserve full cure for demanding use, chemicals, washing, immersion or load—not merely gentle handling.

Avoid this mistake

The first visible change is not always the manufacturer’s final-use milestone.

Compare with similar products

Keep going

Questions

How long does this product take to cure?

Permatex states: The data sheet says that after 72 hours the joint is sealed to pipe burst pressure. Conditions: The source gives no conditions for this time.. The data sheet says full cure is attainable in 24 hours at room temperature, or 1 hour at 200°F. Conditions: At 72°F (22°C).. These are the manufacturer’s stated times, not a guarantee.

How long before a joint with Permatex High Temperature Thread Sealant holds burst pressure?

The data sheet says after 72 hours the joint is sealed to pipe burst pressure. Low-pressure sealing is immediate, full cure is 24 hours, and parts can be repositioned for up to 24 hours.

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

Do not pressurize beyond what the data sheet allows before the stated cure. Follow the product label for your conditions.

Similar products

All gasket makers