What kind of sealant will hold up under the water line? I believe I have a leak around my skimmer box. I used some marine sealant from Lowes. I touched it today and it is starting to disolve. I will drain the water from the area I want to seal. I am not trying to seal under water or in wet conditions. I will be under water once the sealant cures and then and only then will the pool be refilled.