I have a leak on the underside of my hot tub. I cut away all the Styrofoam insulation down to the shell. I can clearly see the underside of the tub and little drops of water form and drip from the area. There is no jet or tube connection here and I cannot see any kind of crack. I looked very close and used a flashlight from the underside to see if I could spot a hole or crack. Nothing. The drops keep forming in numerous spots in that one area. It looks to me like the water is just seeping right through the shell. I am not 100% sure what to put on that seal it up./ I would appreciate any help.