Hempel

Hempadur MultiStrength 35840

Epoxy for immersion and severe atmospheric exposure · INTL · manufacturer-sourced

Check your container: This countdown is for the Epoxy for immersion and severe atmospheric exposure variant. Similar-looking versions may have different times.

How long before you can recoat Hempel Hempadur MultiStrength 35840?

Short answer

Ready for another coat: 8 hours after application.
Fully dry: 7 hours after application.
Industrial protective coatings

Film-build schedule

Recoat has a floor and a ceiling, and film thickness moves both

  1. Prepare the surface and apply the Epoxy for immersion and severe atmospheric exposure to the stated thickness
  2. Recoat inside the window the data sheet gives
  3. Return to service only at the stated cure

This product’s stated stages Quoted at 68°F

  • Fully dry7 hours
  • Ready for another coat8 hours
  • Full cure7 days
  • Recoat window closes30 days

Worth noticing: Recoat inside the window: not before 8 hours and not after 30 days.

Common mistake: Recoating after the maximum window has closed; the next coat may not bond without abrading.

Check the recoat window

When did this coat go on?
Conditions that affect drying
Where?
Thickness

Stated times

  • Recoat window closes30 days
  • Ready for another coat8 hours
  • Fully dry7 hours
  • Full cure7 days

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

Manufacturer website: hempel.com

Conditions & fine print
  • Stated conditions: 68°F (20°C)
  • Protective-coating times are for the stated film thickness, temperature and humidity. Cold steel, thick films and poor airflow lengthen them. Follow the current data sheet.
  • Apply at 50°F or above
  • Region INTL. Formulas can differ between countries; check your container.
  • Recoat window closes: At 20°C, over itself. Beyond that, roughen the surface.
  • Ready for another coat: At 20°C, over itself.
  • Fully dry: At 20°C and 500 microns dry.
  • Full cure: At 20°C and 500 microns dry.
  • 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 Report outdated information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
Hempel Hempadur MultiStrength 35840
Variant
Epoxy for immersion and severe atmospheric exposure
Region
INTL
Listed use
tanks, immersion, steelwork
Timed stages recorded
recoat max, recoat min, full dry, full cure
Source checked
2026-10-25

Documentation: Technical data sheet · Product data sheet 35840

Condition attached to the stated time: At 20°C, over itself. Beyond that, roughen the surface.

About this product

A thick-film epoxy with a 60 minute pot life at 20°C, a 8 hour minimum recoat and a 30 day maximum. Past 30 days the surface must be roughened.

Using this specific product

Hempel Hempadur MultiStrength 35840 is listed here as the Epoxy for immersion and severe atmospheric exposure version for tanks, immersion, and steelwork. For coating steel or industrial surfaces, 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 Epoxy for immersion and severe atmospheric exposure; related versions can use different timing.
  • For tanks, immersion, and steelwork, pay particular attention to surface preparation, film thickness, temperature, dew point and pot life.
  • At 20°C, over itself. Beyond that, roughen the surface. At 20°C, over itself. At 20°C and 500 microns dry.

How to check readiness

Check dry film thickness and the recoat window before the next coat. The sheet gives a maximum overcoating interval of 30 days. Before recoating, confirm the first coat matches the manufacturer’s stated condition; if the maximum window passed, check whether sanding is required. The sheet gives hard dry in 7 hours.

Avoid this mistake

Recoat windows can close; past the maximum, abrading is usually required.

Compare with similar products

Keep going

Questions

How long before you can recoat this product?

Hempel states: The sheet gives a maximum overcoating interval of 30 days. Conditions: At 20°C, over itself. Beyond that, roughen the surface.. The sheet gives a minimum overcoating interval of 8 hours. Conditions: At 20°C, over itself.. The sheet gives hard dry in 7 hours. Conditions: At 20°C and 500 microns dry.. The sheet gives full cure in 7 days. Conditions: At 20°C and 500 microns dry.. These are the manufacturer’s stated times, not a guarantee.

How long can I leave Hempadur MultiStrength before recoating?

The sheet gives a maximum of 30 days at 20°C, then the surface must be roughened.

How long does this product take to fully cure?

Hempel states: The sheet gives full cure in 7 days. Conditions: At 20°C and 500 microns dry.. These are the manufacturer’s stated times, not a guarantee.

How long until this product is fully dry?

Hempel states: The sheet gives hard dry in 7 hours. Conditions: At 20°C and 500 microns dry.. These are the manufacturer’s stated times, not a guarantee.

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

Protective-coating times are for the stated film thickness, temperature and humidity. Cold steel, thick films and poor airflow lengthen them. Follow the current data sheet. Follow the product label for your conditions.

Similar products

All industrial protective coatings