Sika

Sikaflex WS-202 FK with SikaBooster B-1M

Two-component accelerated sealant · US · manufacturer-sourced

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

How long does Sikaflex WS-202 FK with SikaBooster B-1M take to dry?

Short answer

Tack-free: 15 minutes after application.
Caulk & sealant

Bead cure stages

Skin, tack-free and paint-ready are not the same moment

  1. Gun a continuous bead of Two-component accelerated sealant
  2. Tool it inside the working time
  3. Keep it dry until the stated water-ready time

This product’s stated stages Quoted at 73°F and 65% humidity

  • Tack-free15 minutes

Worth noticing: The manufacturer states only one timing here (tack-free, 15 minutes); nothing else is inferred.

Common mistake: Showering or painting at skin-over, when the bead is only crusted on the outside.

Caulk & sealant

Bond-strength path

Assembly, handling and full load are different stages

1 · AssembleClean, fit and apply the Two-component accelerated sealant 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 caulk cure

When did you run the bead?
Conditions that affect drying
Where?
Thickness

Stated times

  • Tack-free15 minutes

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 65% relative humidity
  • Times depend on temperature, humidity, film or bead thickness and airflow. Follow the current data sheet and label.
  • Region US. Formulas can differ between countries; check your container.
  • Tack-free: At 20°C and 65% 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 Report outdated information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 WS-202 FK with SikaBooster B-1M
Variant
Two-component accelerated sealant
Region
US
Listed use
bonding, industrial sealing
Timed stages recorded
tack free
Source checked
2026-10-25

Documentation: Technical data sheet · Product data sheet v01.02, September 2026

Condition attached to the stated time: At 20°C and 65% relative humidity.

About this product

A booster-accelerated sealant that is tack-free in 15 minutes and builds lap-shear strength quickly: 1.4 MPa at 0.5 hours and 5.2 MPa at 4 hours at 20°C.

Using this specific product

Sika Sikaflex WS-202 FK with SikaBooster B-1M is listed here as the Two-component accelerated sealant version for bonding and industrial sealing. For sealing a joint, 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 Two-component accelerated sealant; related versions can use different timing.
  • For bonding and industrial sealing, pay particular attention to joint depth, tooling, ventilation and exposure to water.
  • At 20°C and 65% relative humidity.

How to check readiness

Probe an inconspicuous edge for a continuous skin and follow the stated water-exposure milestone. The sheet gives a tack-free time of 15 minutes (JASO M338-89).

Avoid this mistake

Surface skin is not the same as through-cure, especially in a deep joint.

Compare with similar products

Keep going

Questions

How long does this product take to dry?

Sika states: The sheet gives a tack-free time of 15 minutes (JASO M338-89). Conditions: At 20°C and 65% relative humidity.. These are the manufacturer’s stated times, not a guarantee.

How quickly does WS-202 FK build strength?

The sheet lists 1.4 MPa at 0.5 hours, 3.5 at 1 hour, 4.6 at 2 hours and 5.2 at 4 hours at 20°C.

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

Times depend on temperature, humidity, film or bead thickness and airflow. Follow the current data sheet and label. Follow the product label for your conditions.

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