How do I apply Flex Seal? Official Site
/Q: How do I apply Flex Seal®?

Q: How do I apply Flex Seal®?

  • Read entire can. Wear face and eye protection, protective gloves, and clothing.
  • Make sure the area is clean, dry and free of grease, oil, and dirt.
  • Shake well: Spray 8” to 12” from surface using an even sweeping motion.
  • Apply several even coats until ALL cracks and holes have been filled.
  • Allow 24 to 48 hours to dry before applying another coat. Fully cures in 48 hours.
  • Use Flex Seal® ONLY in a well-ventilated area. When using inside, prevent vapor buildup by opening doors and windows. Ensure fresh air entry during application and drying. Do not use near heat, sparks, pilot lights or other sources of ignition.

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