Features and Benefits: Epoxy Putty Two Part Hand Kneadable for Underwater Applications Carded Great for repairing plumbing fuel tanks tubs showers drains boats and portable water tanks Sets in 25 minutes cures in 1 hour to an off-white color with a tensile strength of 900 PSI WATERWELD can be applied under water: surfaces to be repaired do not need to be clean and dry. Simply cut off as much of the material as you need twist and knead with your fingers until color is uniform with no streaks apply immediately to surface to be repaired.