Flex Glue
Flex Seal · hybrid polymer
Full cure (70°F / 50% RH)
24h
Min application temp
0°F
Max application temp
150°F
Open time
10 min
Dry to touch
60 min
Estimate Cure Time
Common use-case guides
When this estimate may be unsafe
- - The joint, bead, pour, or repair is thicker than the product data sheet assumes.
- - The substrate is colder than the surrounding air, wet, oily, dusty, painted, or otherwise poorly prepared.
- - The repair will carry weight, resist water pressure, or be safety-critical before full cure.
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Quick answers
How long does Flex Glue take to cure?
Flex Glue fully cures in 24 hours at standard laboratory conditions, usually 70°F / 21°C and 50% relative humidity. At colder temperatures or difficult humidity, cure time can increase significantly.
What is the minimum temperature to use Flex Glue?
The minimum application temperature for Flex Glue is 0°F (-18°C). Applying below this threshold can prevent proper curing and cause the bond or seal to fail.
How long does Flex Glue take to cure in cold weather?
Cold temperatures significantly extend cure time. As a rule of thumb, every 18°F (10°C) below 70°F can roughly double cure time. Enter your actual temperature in the calculator for a product-specific estimate.
Does humidity affect Flex Glue cure time?
Yes. Flex Glue needs atmospheric moisture to trigger its cure reaction. Below 30% RH curing will stall. Above 80% RH premature surface skinning can prevent interior cure. Optimal range is 40-70% RH.
What is the open time for Flex Glue?
Flex Glue has a working open time of 10 minutes at standard conditions. At higher temperatures open time may shorten; at lower temperatures cure may slow after assembly.