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if i tap it complete and screw a stud in it with some type of sealant will the water make it up and of stud,thanks



No thats what the sealant is for. Now some sealants are better than others. Epoxy will seal great (make sure to run a solvent--like laquer thinner) q-tip through the threads to degrease first)but its a pretty permanent installation. Teflon sealants--tape or compound, permatex etc. I would stay away from RTV for threads (because if the threads are disturbed after intial cure they can lose their seal)