Any way to get some sealer around a leaky tire valve stem? I'm sure I used new ones when I mounted them, but now I have an annoying little leak that after several months goes from 35 to 20 psi. There's a tool that screws onto the stem to pull it through the rim when you change it out. I was wondering if I could use that to yank on it, draw it out enough to smear some sealer around it where it sits in the rim, then let it snap back in. I just want to avoid breaking the bead if I don't absolutely have to as they are bitchy aluminum snow flake rims. But I will if there's no trick to seal this damn thing. Any ideas?