Flex Seal

Flex Seal Liquid Rubber Sealant Coating

All colors · US · not yet reviewed

Short answer

Full cure: 1–2 days after application.

Start the clock

When did you apply it?
Outdoors, temperature
Where?
Thickness

Stated times

  • Full cure1–2 days

From Flex Seal data sheet · checked 2026-10-24. Anything not listed isn’t stated by the manufacturer.

Conditions & fine print
  • Stated conditions: Not stated
  • The manufacturer says thick layers or low temperatures may need up to 72 hours. Keep uncured coating away from moisture. This time comes from a manufacturer article, not a data sheet.
  • Temperature range: 40°F to —°F
  • Region US. Formulas can differ between countries; check your container.
  • Full cure: Thick layers or cold: up to 72 hours
  • Entered from the manufacturer source; second review pending. Report outdated information
  • Actual results depend on preparation, thickness, ventilation, temperature, humidity, mixing and substrate.

Questions

How long before Flex Seal Liquid Rubber Sealant Coating is full cure?

Flex Seal states: Cures within 24–48 hours; thick layers or low temps may require up to 72 hours. Conditions: Thick layers or cold: up to 72 hours. This is the manufacturer’s stated time, not a guarantee.

Similar products

All caulks and sealants