Sika

Sikaflex-291i

Marine adhesive sealant · CA · manufacturer-sourced

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

How long does Sikaflex-291i take to dry?

Short answer

Tack-free: 1 hour after application.
Marine & RV

Launch-ready plan

Weatherproof, in-water and underway are different dates

  1. Prepare and apply the Marine adhesive sealant
  2. Keep it dry for the stated time
  3. Launch or use only after the stated cure

This product’s stated stages Quoted at 73°F and 50% humidity

  • Working time ends45 minutes
  • Tack-free1 hour

Worth noticing: Working time is only 45 minutes; the next stated stage, tack-free, is 1 hour.

Common mistake: Launching on the first dry day; most marine products need the immersion time stated.

Marine & RV

Water-exposure plan

Splash, filling and continuous immersion are not equivalent

Brief moisture

Splashes or dampness can use a different milestone.

Continuous water

Filling, launching or immersion requires the exact water milestone.

Use the Marine adhesive sealant directions for marine sealant, boat bedding, and deck hardware; do not infer immersion readiness from touch-dry time.

Time the marine cure

When was the work done?
Conditions that affect drying
Where?
Thickness

Stated times

  • Working time ends45 minutes
  • Tack-free1 hour

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

Manufacturer website: usa.sika.com

Conditions & fine print
  • Stated conditions: 73°F (23°C) and 50% relative humidity
  • Times depend on temperature, humidity, joint depth and airflow. Follow the current data sheet. Application is recommended between 10 and 40°C, optimally 15 to 25°C. The sheet's cure-speed graph is not reproduced here.
  • Temperature range: 50°F to 104°F
  • Region CA. Formulas can differ between countries; check your container.
  • Working time ends: At 23°C (73°F) and 50% relative humidity.
  • Tack-free: At 23°C (73°F) and 50% relative humidity.
  • 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 Report outdated information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
Sika Sikaflex-291i
Variant
Marine adhesive sealant
Region
CA
Listed use
marine sealant, boat bedding, deck hardware
Timed stages recorded
tooling, tack free
Source checked
2026-10-25

Documentation: Technical data sheet · Version 09/2011 (Canadian sheet)

Condition attached to the stated time: At 23°C (73°F) and 50% relative humidity.

About this product

The marine multi-purpose polyurethane from Sika, here from the Canadian data sheet. It separates a 45 minute open time from a 60 minute tack-free time, and refers cure speed to a graph that is not reproduced as numbers.

Using this specific product

Sika Sikaflex-291i is listed here as the Marine adhesive sealant version for marine sealant, boat bedding, and deck hardware. For repairing marine or RV equipment, 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 Marine adhesive sealant; related versions can use different timing.
  • For marine sealant, boat bedding, and deck hardware, pay particular attention to substrate preparation, temperature and water exposure.
  • At 23°C (73°F) and 50% relative humidity.

How to check readiness

Check the immersion or launch milestone—not just touch-dry time. The data sheet gives an open time of about 45 minutes. The data sheet gives a tack-free time of about 60 minutes.

Avoid this mistake

Launching too soon can expose an incompletely cured film continuously.

Compare with similar products

Keep going

Questions

How long does this product take to dry?

Sika states: The data sheet gives an open time of about 45 minutes. Conditions: At 23°C (73°F) and 50% relative humidity.. The data sheet gives a tack-free time of about 60 minutes. Conditions: At 23°C (73°F) and 50% relative humidity.. These are the manufacturer’s stated times, not a guarantee.

What is the difference between open time and tack-free time for Sikaflex-291i?

Open time (about 45 minutes) is how long you can still position parts. Tack-free time (about 60 minutes) is when the surface no longer sticks. Both are measured at 23°C and 50% humidity, and the sheet says curing slows at low temperatures.

How long do I have to work with this product?

Sika states: The data sheet gives an open time of about 45 minutes. Conditions: At 23°C (73°F) and 50% relative humidity.. These are the manufacturer’s stated times, not a guarantee.

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

Times depend on temperature, humidity, joint depth and airflow. Follow the current data sheet. Application is recommended between 10 and 40°C, optimally 15 to 25°C. The sheet's cure-speed graph is not reproduced here. Follow the product label for your conditions.