anyone out there have experience with retreated slime tubes?

Do you mean you have a tube that was treated once with Slime and now you want to treat it again? Why? is the old slime not working or it has all leaked out? The only problem that you might have with doing this is that the old slime might have become stiff, otherwise you shouldn't have a problem. Personally I don't like Slime especially in road tires because it won't seal leaks once you get above 60 to 65psi, it just blows the Slime out until the pressure drops, then while doing this it makes a big gooey green mess inside your rim and tire resulting in replacing your rim strip and cleaning the rim and tire.