[AT] Sealing a tire to a rim

[charlie hill]

I have a slow leak in a 15' trailer tire.  The leak is along the bead of the
tire and is caused by a combination of a 6 ply tire on not the best rim in
the world.  The rim is clean but it is old and maybe not completely straight
and smooth.   I have tried every trick I know to get it to seal now I think
I want to try some sealant of some sort.

What do you guys recommend?  And where do you by your favorite brand.  The
tire will leak down in about 24 hours but the leak is lots of small leaks
around the bead and no big ones.

Charlie