I replaced my light fixture and cord and want to seal up the cord light conduit at the hole in the niche. I bought some JB Weld WaterWeld epoxy putty (Home Depot). (I still have water in the pool).
I kneaded it up and then proceeded to push it into the conduit hole...... IT WON'T STICK .....My niche (in ground plaster pool) is some kind of metal.
What is the best brand that will stick good when applying it under water?