I dont know if I would use the green slime if I were you. It can and will corrode a lot of ATV wheels. Instead I hear nothing but good things about the Berryman's tire sealer. You may want to check into that instead if you are going to go that route.
I know you said they put that bead sealer stuff on the beads but you may want to try some Permatex aviation gasket sealer on the beads. That worked awesome for me.